Document:

Assignment, dated December 20, 2005

 Exhibit 10.13 
 ASSIGNMENT 
 This Assignment, dated as of December 20, 2005, by and among EMCS, Inc. (f/k/a
Emergency Medical Services Corporation), a Delaware corporation (“EMSC”), Emergency Medical Services L.P., a Delaware limited partnership (“EMS LP”), AMR HoldCo, Inc., a Delaware corporation
(“AMR HoldCo” and, together with EMSC and EMS LP, the “Purchasers”) and ClaimCo LP, a Delaware limited partnership (“ClaimCo”). 
 Reference is made to the Stock Purchase Agreement, dated as of December 6, 2004, by and among Laidlaw Medical Holdings, Inc., Laidlaw International,
Inc. (together “Laidlaw”) and Purchaser with respect to the purchase of the outstanding capital stock of American Medical Response, Inc. (the “Purchase Agreement”). Capitalized terms used herein and
not defined shall have the meaning given to such terms in the Purchase Agreement. 
 EMS and Laidlaw have had discussions concerning
(i) the understatement of accounts receivable allowances reflected in various balance sheets included in the historical financial statements of American Medical Response, Inc., including an approximately $50 million understatement of such
allowances in the Closing Balance Sheet delivered by Laidlaw to EMS pursuant to Section 1.05 of the Purchase Agreement and (ii) the claims that may arise under the Purchase Agreement as a result of such understatements, including, without
limitation, a possible Post-Closing Adjustment under Section 1.05 of the Purchase Agreement and potential claims for indemnification under Article VIII of the Purchase Agreement (collectively, the “A/R-Related Claims”).

 As permitted by Section 10.03 of the Purchase Agreement, and subject to the provisions of paragraphs 2 and 3 of this Assignment,
Purchasers wish to assign to ClaimCo, and ClaimCo wishes to accept and assume from Purchasers, Purchasers’ rights under the Purchase Agreement with respect to the A/R-Related Claims (the “Assigned Rights”). 

NOW THEREFORE, intending to be legally bound, the parties hereby agree as follows: 
 1. Assignment by Purchasers. Subject to the provisions of paragraphs 2 and 3, Purchasers hereby assign, transfer, grant and otherwise convey to
ClaimCo, and ClaimCo hereby accepts and assumes from Purchasers, the Assigned Rights. 
 2. Retained Rights. The Assigned Rights are
limited to aggregate recoveries of ClaimCo, less all costs and expenses incurred by ClaimCo in connection with the A/R-Related Claims (including, without limitation, costs and expenses of investigation, attorneys’ fees and expenses and fees and
expenses of any other third parties), totaling $50.0 million, and any recoveries in excess of such amount shall be and remain the joint property of EMS LP and AMR HoldCo. Purchasers shall not be responsible for, and shall not fund, any costs or
expenses incurred in connection with the A/R-Related Claims from and after the effective time of this Assignment. 
 3. Retained
Liability. EMSC acknowledges that it continues to be liable for all of the obligations of Purchaser under the Purchase Agreement. 
 *         *         * 

 This Assignment shall be deemed to be effective concurrently with the consummation of the initial public
offering of common stock by Emergency Medical Services Corporation which is being effected on the date hereof. 
 IN WITNESS WHEREOF, the
parties hereto have caused this Assignment to be executed and delivered as of the date first written above. 
  

					
	EMSC, Inc.
		
	By:	 	/s/ Todd G. Zimmerman
		 	Name:	 	Todd G. Zimmerman
		 	Title:	 	Secretary
	
	EMERGENCY MEDICAL SERVICES L.P.
		
	By:	 	EMSC, Inc.
		 	its general partner
		
	By:	 	/s/ Todd G. Zimmerman
		 	Name:	 	Todd G. Zimmerman
		 	Title:	 	Secretary
	
	AMR HOLDCO, INC.
		
	By:	 	/s/ Todd G. Zimmerman
		 	Name:	 	Todd G. Zimmerman
		 	Title:	 	Secretary
	
	 CLAIMCO LP

		
	By:	 	EMSC, Inc.
		 	its general partner
		
	By:	 	/s/ Todd G. Zimmerman
		 	Name:	 	Todd G. Zimmerman
		 	Title:	 	Secretary

  

 [Signature Page to Assignment]Form of Employee Equity Option Agreement

 Exhibit 10.14.1 
 EQUITY OPTION AGREEMENT 
 THIS AGREEMENT entered into as of
                 , 2005 by and between Emergency Medical Services L.P., a Delaware limited partnership (the “Company”), and the
undersigned employee of the Company or a subsidiary thereof (the “Optionee”). 
 RECITALS 
 The Company maintains the Emergency Medical Services L.P. Equity Option Plan (the “Plan”). 
 Pursuant to the Plan, the Company desires to grant the Optionee an option to acquire Units. 
 NOW, THEREFORE, the Company and the Optionee, intending to be legally bound, hereby agree as follows: 
 1. Definitions. Any capitalized term not defined in this Agreement shall have the meaning set forth in the Plan. As used in this Agreement, the
following terms have the meanings set forth below: 
 “Cumulative Cash Flow Target” means EBITDA of not less than the
Target Amount for the four consecutive calendar years ending December 31, 2008 (the “Measurement Period”). As used herein: 
 “EBITDA” means the consolidated net income of the Company and its subsidiaries, (a) adjusted by adding thereto, to the extent deducted in determining such consolidated net income,
interest, taxes, depreciation and amortization, and (b) further adjusted to eliminate any costs, or to add any income, that the Board determines in good faith is appropriate to reflect non-recurring or unusual items. 
 “Target Amount” means (a) $617.4 million (being 90% of the EBITDA included in management’s base case projected in
connection with the acquisition of the Company), plus (b) the Target EBITDA of any Business acquired by the Company after the date of this Agreement. The Board shall make such adjustment to the Target Amount and the Target EBITDA as it
determines in good faith to be appropriate to reflect non-recurring or unusual items, including the sale of any Business during the Measurement Period. 
 “Target EBITDA” of a Business acquired by the Company means the EBITDA of that Business for the balance of the Measurement Period, as reflected in the projections considered by the Board in
connection with such acquisition. The acquisition of a “Business” means the acquisition of a corporation or other entity or all or a substantial portion of the assets used by another corporation or other entity to conduct business
operations. 
 “15% Internal Rate of Return” means an Investor Return, in cash, at least equal to an amount
determined by increasing the amount of the initial investment, and all subsequent direct or indirect investments by Onex, by the total compounded annual rate of return of 15%, taking into account for these purposes the exercise of all options to
purchase Units outstanding 

 under the Plan or otherwise (including, without limitation, options, other stock awards or interests held by affiliates
of Onex and their respective employees), which are then exercisable or become exercisable as a result of the realization of the 15% Internal Rate of Return. The determination of whether the 15% Internal Rate of Return has been realized shall be made
by the Board whose decision shall be final and binding on the Optionee. For the avoidance of doubt, a 15% Internal Rate of Return shall be deemed realized only if the Investor Return includes both the amount of the investments and the required
return on the investments. 
 “Investor Return” means the sum of all cash amounts actually received by Onex, on a
cumulative basis through the date of determination, in the form of cash dividends, other distributions or sale proceeds in connection with (a) a disposition of all or any part of its Units calculated based on the actual net proceeds received
from the disposition of such Units, (b) a disposition of all or substantially all of the assets of the Company or a subsidiary or (c) a recapitalization of the Company or any subsidiary. Such calculation shall take into account any
transaction costs and fees and shall exclude any management, consulting or other similar fees received by Onex or its affiliates. 
 “IPO/Recap” means an initial public offering of the equity of the Company (an “IPO”) or a recapitalization of the Company. 
 “Onex” means Onex Partners LP. 
 2. Grant of Option. Effective as of the “Grant Date” set forth on the signature page of this Agreement, the Company hereby grants to the Optionee an option (the
“Option”) to purchase the number of Units set forth on the signature page of this Agreement on the terms and conditions hereinafter set forth. 
 3. Exercise Price. The “Exercise Price” for the Units covered by the Option is the Exercise Price set forth on the signature page of this Agreement. 
 4. Vesting and Exercisability. 
 (a)
The Options shall vest and become exercisable in the following two ways: 
 (i) Time Vesting. Twelve and one-half
percent (12.5%) of the Options shall become vested and exercisable on each of the first four anniversaries of the Grant Date. 
 (ii) Time and Performance Vesting. An additional twelve and one-half percent (12.5%) of the Options shall vest and become exercisable on each of the first four anniversaries of the Grant Date, provided, that
exercisability is subject to the further condition that Onex has realized a 15% Internal Rate of Return. 
 (b) Notwithstanding the provision
of clauses (a)(i) and (ii), upon the occurrence of a Liquidity Event in which Onex realizes a 15% Internal Rate of Return, all of the Options shall become fully vested and exercisable on the date of such Liquidity Event and the Options shall
terminate and be of no further force or effect if they are not exercised in connection with, and on the date of, such Liquidity Event. For the purposes of the preceding sentence only, the 15% Internal Rate of Return shall be determined based on
(i) cash received by Onex at any time and/or (ii) the fair market value of assets received by Onex at any time (as such fair market value is determined by the Board). Any assets received by the Optionee in the Liquidity Event shall be
subject to the same restrictions (such as lock-up provisions) to which the assets received by Onex are subject. 
  

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 (c) On the fourth anniversary of the Grant Date, if the Options referred to in clause (a)(ii) have time
vested but are not exercisable because Onex has not realized a 15% Internal Rate of Return, then such Options shall also become exercisable on that date if: 
 (A) the Company has met the Cumulative Cash Flow Target, or 
 (B) if (x) the Units are publicly traded and listed on a national securities exchange or on NASDAQ and (y) Onex would have
realized a 15% Internal Rate of Return if it had sold its remaining Units at a per Unit price equal to the weighted average sale price of the Units (as quoted by such national securities exchange or NASDAQ) for any 30 consecutive trading days.

 (d) Upon the consummation of a Liquidity Event, Options that are not vested, or are not exercisable because Onex has not realized a 15%
Internal Rate of Return, as well as Options that are vested but are not exercised by the Optionee, shall terminate automatically on the consummation of the Liquidity Event, and be of no further force or effect. The occurrence of an IPO/Recap shall
not affect the vesting of the Options. 
 5. Term of Options. Each Option (whether or not then exercisable) shall terminate
automatically on the earliest to occur of: 
 (a) 180 days after the date of the Optionee’s termination of employment due
to death or disability; 
 (b) 30 days after the date of the Optionee’s termination of employment by the Company without
Cause; 
 (c) subject to the provisions of clauses (a) and (b), the date on which the Optionee’s employment with the
Company is terminated, whether by the Company or the Optionee; 
 (d) the date of the consummation of a Liquidity Event;

 (e) the liquidation or dissolution of the Company; and 
 (f) the tenth anniversary of the Grant Date. 
 6. Manner of Exercise of Option. 
 (a) The Optionee may exercise any then exercisable Option in
accordance with the provisions of the Plan. 
 (b) The Company may delay the issuance of Units covered by the Option as provided in the Plan.

  

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 7. Non-Transferability. The Option is not transferable except as provided is the Plan. The right
of the Optionee to exercise the Option (as and when exercisable) shall not be assignable or transferable by the Optionee otherwise than by will or the laws of descent and distribution, and such Units may be purchased during the lifetime of the
Optionee only by him (or his legal representative in the event that he is disabled). Any other transfer shall be null and void and without effect, including, without limitation, any purported assignment, whether voluntary or by operation of law,
pledge, hypothecation or other disposition contrary to the provisions hereof, or levy of execution, attachment, trustee process or similar process, whether legal or equitable, upon the Option. 
 8. Representation Letter and Investment Legend. 
 (a) If the disposition of the Units to be issued upon exercise of an Option are not covered by a current registration statement under the Securities Act when the Option is exercised, the Committee may require the
Optionee, as a condition precedent to receipt of the Units, to represent to the Company in writing that the Units acquired by such Optionee are acquired for investment only and not with view to distribution. The Company shall place a legend upon any
certificate for the Units issued by reason of such exercise. 
 (b) The Company shall be under no obligation to qualify Units for sale under
any securities laws or to cause a registration statement or a post-effective amendment to any registration statement to be prepared for the purposes of covering the issue or sale of Units. 
 9. Adjustments upon Changes in Capitalization. 
 (a) In the event that the outstanding Units are changed into or exchanged for a different number or kind of units or other securities of the Company or of another entity by reason of any reorganization, merger,
consolidation, recapitalization, reclassification, combination of units, or dividends payable in capital stock, the Committee shall make appropriate adjustment in the number and kind of units, and the Exercise Price therefor, as to which the Option,
to the extent not theretofore exercised, shall be exercisable. 
 (b) In connection with a Liquidity Event, and without limiting the
provisions of Sections 4(d) and 5(d), the Company may, in the sole discretion of the Board, deliver to the Optionee, to the extent that the right to purchase Units under the Option has vested and is exercisable, the same kind of consideration
(net of the Exercise Price for such Units) that is delivered to the Unitholders of the Company as a result of such Liquidity Event, or the Board may, in its sole discretion, cancel the Option, to the extent not thereto for exercised, in exchange for
cash consideration in an amount equal to the value of those securities or other consideration the Optionee would have received had the Option been exercised (to the extent it has vested and is exercisable and has not been exercised), less the
Exercise Price therefor. Upon the Optionee’s receipt of such consideration, the Option shall immediately terminate and be of no further force or effect, whether vested or not. The value of the securities or other consideration the Optionee
would have received if the Option had been exercised and the value of any consideration exchanged for an Option shall be determined in good faith by the Board. Without limiting the foregoing, payment of any consideration pursuant to this
Section 9(b) may be made in cash to the Optionee if the Optionee is not an accredited investor within the meaning of Regulation D under the Securities Act. 
 (c) Upon the dissolution or liquidation of the Company, the Option shall terminate, but the Optionee (if at such time in the employ the Company or any of its subsidiaries) shall have the right, immediately prior to
such dissolution or liquidation, to exercise any Options that have vested and are exercisable. 
  

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 10. Joinder to Partnership and Equityholders Agreements. As a condition to the grant of Options,
and by execution of this Agreement, each Optionee agrees to be bound by the terms of each of: 
 (a) the Agreement of Limited Partnership of
the Company, dated as of February 10, 2005, by and among the Company, Onex Partners LP and the other parties named therein (as the same may be amended, supplemented or otherwise modified from time to time, the “Partnership
Agreement”) as if such Optionee were a signatory thereto and such Optionee acknowledges that each Option, and all Units acquired by him or her upon exercise of such Options, will be subject to the terms and conditions contained in the
Partnership Agreement, and 
 (b) the Equityholders Agreement, dated as of February 10, 2005, by and among the Company and certain
equityholders of the Company named therein (as the same may be amended, supplemented or otherwise modified from time to time, the “Equityholders Agreement”), as if such Optionee were a signatory thereto and such Optionee
acknowledges that each Option, and all Units acquired by him or her upon exercise of such Options, will be subject to the terms and conditions contained in the Equityholders Agreement; provided however, that any Optionee party to the Investor
Equityholders Agreement, dated as of February 10, 2005, by and among the Company and certain equityholders of the Company named therein (as the same may be amended supplemented or otherwise modified from time to time, the “Investor
Equityholders Agreement”) shall not be deemed to have executed the Equityholders Agreement and such Optionee acknowledges that each Option, and all Units acquired by him or her upon exercise of such Options, will be subject to the terms
and conditions contained in the Investor Equityholders Agreement. 
 11. No Employment Rights. Nothing contained in this Agreement
shall be construed or deemed by any person under any circumstances to bind the Company or any of its subsidiaries to continue the employment of the Optionee for any period. 
 12. No Rights as a Limited Partner. The Optionee shall have no rights as a limited partner with respect to any Units unless and until the Company
has received consideration equal to the Exercise Price for such Units and the issuance of such Units are recorded on the Unit register of the Company. No adjustment shall be made for dividends or other rights for which the record date is prior to
the date such Units are recorded on the Unit register of the Company. 
 13. Withholding Taxes. The Optionee hereby agrees, as a
condition to any exercise of the Option, to pay the Company an amount sufficient to satisfy its obligation to withhold federal, state and local taxes arising by reason of such exercise (the “Withholding Amount”), if any, by
(a) authorizing the Company to withhold the Withholding Amount from his cash compensation, or (b) remitting the Withholding Amount to the Company in cash; provided that, to the extent that the Withholding Amount is not provided by
one or a combination of such methods, the Company may at its election withhold from the Units delivered upon exercise of the Option that number of Units having a Fair Market Value equal to the Withholding Amount. 
  

 5 

 14. Option Terms. This Agreement supersedes the provisions of any employment agreement between the
Optionee and the Company, or a subsidiary thereof, with respect to the terms of any options to be granted by the Company or any affiliate. 
 [Signature page follows] 
  

 6 

 IN WITNESS WHEREOF, the Company has caused this Agreement to be executed, by its officer thereunto duly
authorized, and the Optionee has executed this Agreement, all as of the day and year first above written. 
  

									
	EMERGENCY MEDICAL SERVICES L.P.	  	OPTIONEE
				
	By:	  	Emergency Medical Services Corporation, its general partner	  	By:	  	  
 (signature)

				
	By:	  	  
	  		  	  

	Name:	  		  		  		  	(print name)
	Title:	  		  		  		  	

  

									
		  		  		  	  
 Address:

					
		  		  		  	Facsimile No.	 	  

					
		  		  		  	Social Security No.	 	  

 The Option granted hereby is as follows: 
 Optionee: _________________________________________ 
 Grant Date: _______________________________________ 
 Number of Class B Units: ____________________________ 
 Exercise Price:                 
$___________________________ 
 [Signature page to Equity Option Agreement] 
  

 7 

 EXERCISE FORM 
 EMERGENCY MEDICAL SERVICES L.P. 
 c/o EMERGENCY MEDICAL SERVICES CORPORATION, its general partner 
 6200 S. Syracuse Way 
 Suite 200 
 Greenwood Village, CO 80111 
 The undersigned holder of
                     Options granted by EMERGENCY MEDICAL SERVICES L.P. pursuant to an Equity Option Agreement, dated
                    , 2005, hereby irrevocably exercises the right to acquire and subscribe for those securities identified below issuable on
the exercise of all or part of such Option, on the terms specified in the said Option Agreement, the Plan and all instruments supplemental thereto: 
  

			
	 Number of Class B Units to be acquired:
	 	  
                                       
                              
  

		
	 Exercise Price per Unit:
	 	                                      
                              
		
	 Aggregate Exercise Price payable:
	 	                                      
                              

 and hereby tenders a certified check or cash for such aggregate Exercise Price, and directs such securities to be
registered in the holder’s name and recorded on the Unit register of Emergency Medical Services L.P. as set out below. 
 The holder of this Option
hereby acknowledges and agrees that: (i) before the securities referred to above will be issued or any payment with respect to this Option will be made, the holder of this Option must pay, or make arrangements satisfactory to the Company with
respect to the payment of, any amount necessary to comply with any U.S. federal, state or local tax withholding requirements that apply as a result of the exercise hereof (or payment made with respect to this Option), and (ii) if such holder
makes an election under Section 83(b) of the Internal Revenue Code with respect to the securities purchased hereunder, the undersigned must deliver a copy of such election to the Company at the time it is filed with the Internal Revenue
Service. 
 Dated this      day of
                    ,      
  

	
	  
 (Signature of Holder)

	  
  
 (Print Full Name)

	  
  
 (Address)

 INSTRUCTIONS: 
  

	1.	The holder may exercise his right to receive securities pursuant to the Option by completing this form and surrendering this form, together with the Exercise Price, to the Secretary
of Emergency Medical Services Corporation, the general partner of Emergency Medical Services L.P., at its principal office listed above, along with (i) any documents requested by the Company with respect to payment of any amount necessary to
comply with any U.S. federal, state or local or foreign tax withholding requirements and (ii) if applicable, a copy of such holder’s election under Section 83(b) of the Internal Revenue Code. 

  

	2.	Evidence of recordation of the Units represented by this Option on the Emergency Medical Services L.P. Unit register will be delivered or mailed as soon as practicable after the
exercise of the Option. 

  

	3.	If this exercise form is signed by a trustee, executor, administrator, curator, guardian, attorney or any other person acting in a fiduciary or representative capacity, the notice
must be accompanied by evidence of authority to sign satisfactory to EMERGENCY MEDICAL SERVICES L.P. 

 * * *

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