Document:

Amendment No. 2 Dated as of March 3,2008

 Exhibit 10.24 
 EXECUTION COPY 
 AMENDMENT NO. 2 
 AMENDMENT NO. 2 (this “Amendment No. 2”) dated as of March 3, 2008 among AMBAC FINANCIAL GROUP, INC. and AMBAC ASSURANCE
CORPORATION (collectively the “Borrowers” and each a “Borrower”), the Lenders executing this Amendment No. 2 and CITIBANK, N.A., in its capacity as Administrative Agent under the Credit Agreement referred to
below (the “Administrative Agent”). 
 The Borrowers, the Lenders party thereto (including the Lenders executing this
Amendment No. 2) and the Administrative Agent are parties to a First Amended and Restated Revolving Credit Agreement dated as of July 30, 2007 (as amended by Amendment No. 1 thereto and as amended, supplemented and otherwise modified
from time to time and in effect on the date hereof, the “Credit Agreement”). 
 The Borrowers and the Lenders party hereto
wish now to amend the Credit Agreement in certain respects, and, accordingly, the parties hereto hereby agree as follows: 
 Section 1.
Definitions. Except as otherwise defined in this Amendment No. 2, terms defined in the Credit Agreement are used herein as defined therein. 
 Section 2. Amendments. Subject to the satisfaction of the conditions precedent specified in Section 4 hereof, but effective as of the date hereof, the Credit Agreement shall be amended as follows:

 2.01. References Generally. References in the Credit Agreement (including references to the Credit Agreement as amended hereby) to
“this Agreement” (and indirect references such as “hereunder”, “hereby”, “herein” and “hereof”) shall be deemed to be references to the Credit Agreement as amended hereby. 
 2.02. Asset Dispositions. Section 5.02(c) of the Credit Agreement is hereby amended to read in its entirety as follows: 
 “(c) Asset Dispositions. It will not, and will not permit any of its Material Subsidiaries to, sell, transfer, lease,
contribute or otherwise convey, or grant options, warrants or other rights with respect to, all or any substantial part of its property, revenues or assets (including accounts receivable and capital stock of any of its Material Subsidiaries) to any
Person (any of the foregoing, an “Asset Disposition”); provided, however, that (X) each Borrower and its Material Subsidiaries may consummate (i) Asset Dispositions in the ordinary course of their business
and (ii) any Asset Disposition, to the extent that immediately after giving effect to such Asset Disposition, the aggregate fair market value (determined at the time of the applicable transactions) of all assets subject to Asset Dispositions
(other than those described in clause (i) consummated by the Borrowers and their respective Subsidiaries in such fiscal year) and consummated in such fiscal year, would not exceed 25% of the stockholders’ equity of Ambac Financial and its
Subsidiaries, on a Consolidated basis (excluding unrealized gains on investments and unrealized losses on investments), at the end of the next preceding fiscal year and (Y) this Section 5.02(c) shall not prohibit Ambac Financial from
contributing to Ambac Assurance all or any part of the proceeds of one or more issuances of equity or other securities by Ambac Financial so long as any such issuance shall have been consummated by Ambac Financial on or before the date that is 75
days after the date of Amendment No. 2 hereto.” 
 AMENDMENT NO. 2 

 Section 3. Representations and Warranties. Each Borrower represents and warrants to the
Lenders and the Administrative Agent, as to itself and each of its Subsidiaries, that (a) except, for purposes of the last sentence of Section 4.01(e) of the Credit Agreement and Section 4.01(f) of the Credit Agreement, as described
in Ambac Financial Group, Inc.’s Form 10-K for the fiscal year ended December 31, 2007 (as filed with the Securities and Exchange Commission on February 29, 2008), the representations and warranties set forth in Article IV of the
Credit Agreement (after giving effect to the amendments contemplated herein) are true and complete on the date hereof as if made on and as of the date hereof (or, if any such representation or warranty is expressly stated to have been made as of a
specific date, such representation or warranty shall be true and correct as of such specific date), and as if each reference in said Article IV to “this Agreement” included reference to this Amendment No. 2 (it being agreed that it
shall be deemed to be an Event of Default under the Credit Agreement if any of the foregoing representations and warranties shall prove to have been incorrect in any material respect when made), and (b) no Default or Event of Default has
occurred and is continuing. 
 Section 4. Conditions Precedent. 
 (a) General. The amendments set forth in Section 2 hereof shall become effective, as of the date hereof, upon satisfaction of the following
conditions: 
 (i) Execution. The Administrative Agent shall have received counterparts of this Amendment No. 2
executed by the Borrowers, the Administrative Agent and the Lenders party to the Credit Agreement constituting the Required Lenders. 
 (ii) Amendment Fee. The Administrative Agent shall have received for the account of each Lender that, not later than 6:00 p.m. New York City time on March 3, 2008 (the “Final Consent Time”), shall have executed
a counterpart of this Amendment No. 2 and delivered the same to the Administrative Agent, an amendment fee in an amount that shall have been agreed among the Borrowers and the Administrative Agent. 
 (iii) Expenses. The Borrowers shall have paid in full the costs, expenses and fees as set forth in Section 8.04(a) of the
Credit Agreement. 
 Section 5. Miscellaneous. Except as herein provided, the Credit Agreement shall remain unchanged and in full
force and effect. This Amendment No. 2 may be executed in any number of counterparts, all of which taken together shall constitute one and the same amendatory instrument and any of the parties hereto may execute this Amendment No. 2 by
signing any such counterpart. Delivery of a counterpart by electronic transmission shall be effective as delivery of a manually executed counterpart hereof. This Amendment No. 2 shall be governed by, and construed in accordance with, the law of
the State of New York. 
 AMENDMENT NO. 2 

 IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 2 to be duly executed by their
respective authorized officers as of the day and year first above written. 
  

			
	AMBAC FINANCIAL GROUP, INC.
		
	By	 	 /s/ David Trick

	Name:	 	David Trick
	Title:	 	Managing Director and Treasurer
	
	AMBAC ASSURANCE CORPORATION
		
	By	 	 /s/ David Trick

	Name:	 	David Trick
	Title:	 	Managing Director and Treasurer
	
	CITIBANK, N.A., as Administrative Agent
		
	By	 	 /s/ Maureen P. Maroney

	Name:	 	Maureen P. Maroney
	Title:	 	Director

 AMENDMENT NO. 2 

			
	LENDERS
	
	CITIBANK, N.A.
		
	By	 	 /s/ Maureen P. Maroney

	Name:	 	Maureen P. Maroney
	Title:	 	Director

 AMENDMENT NO. 2 

			
	LENDERS
	
	The Bank of New York
		
	By	 	 /s/ Lizanne T. Eberle

	Name:	 	Lizanne T. Eberle
	Title:	 	Managing Director

 AMENDMENT NO. 2 

			
	LENDERS
	
	KeyBank National Association
		
	By	 	 /s/ Mary K. Young

	Name:	 	Mary K. Young
	Title:	 	Senior Vice President

 AMENDMENT NO. 2 

			
	HSBC Bank USA, National Association
		
	By	 	 /s/ Lawrence Karp

	Name:	 	Lawrence Karp
	Title:	 	Senior Vice President

 AMENDMENT NO. 2 

			
	 LENDERS

	
	 MERRILL LYNCH BANK USA

		
	 By
	 	 /s/ Louis Alder

	 Name:
	 	 Louis Alder

	 Title:
	 	 First Vice President

 AMENDMENT NO. 2Schedule of Parties to Indemnification Agreement

 EXHIBIT 10.10.1 
 LIST OF INDEMNITEES 
 Each of the individuals identified below is party to an indemnification agreement with ISTA
Pharmaceuticals, Inc. in the form filed as Exhibit 10.10 to ISTA’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007: 
 Vicente Anido, Jr., Ph.D. 
 Lauren P. Silvernail 
 Marvin J. Garrett 
 Kirk McMullin 
 Thomas A. Mitro

 Kathleen McGinley 
 Timothy R. McNamara, Pharm.D. 

Peter Barton Hutt 
 Kathleen D. LaPorte 
 Benjamin F. McGraw III, Pharm.D. 
 Dean J. Mitchell 
 Andrew J. Perlman 
 Wayne I. Roe 
 Richard C. WilliamsSchedule of Parties to Executive Employment Agreement.

 EXHIBIT 10.21.1 
 EXECUTIVE OFFICERS PARTY TO AN EXECUTIVE EMPLOYMENT AGREEMENT 
 Each of the individuals identified below is party to
an executive employment agreement with ISTA Pharmaceuticals, Inc. in the form filed as Exhibit 10.21 to ISTA’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007: 
 Marvin J. Garrett 
 Kathleen McGinley 
 Kirk McMullin 
 Thomas A. Mitro 
 Tim McNamaraDirector Compensation Plan

 EXHIBIT 10.22 
 DOMINION HOMES, INC. 
 2007 Director Compensation Plan 
  

	1.	Director Fees (paid quarterly in advance)* 

  

	 	(a)	$40,000 annual fee for each outside director ($10,000 per quarter) 

  

	 	(b)	Additional $5,000 annual fee ($1,250 per quarter) for: 

  

	 	•	 	 each Audit Committee member (other than Audit Committee Chair) 

	 	•	 	 the Compensation Committee Chair, and 

	 	•	 	 the Governance Committee Chair 

  

	 	(c)	Additional $10,000 annual fee for the Audit Committee Chair ($2,500 per quarter) 

  

	2.	Annual award of options to purchase 2,500 common shares of the Company (non-qualified). 

  

	3.	Reimbursement of expenses incurred in personal financial planning of up to $7,500 in any calendar year. 

  

	4.	Participation in Executive Deferred Compensation Plan – allows directors to defer receipt of their director fees and receive a matching contribution of 25% with respect to
those fees, not to exceed $2,500 in any year. 

  

	*	Directors receive 50% of their director and committee fees otherwise payable to them in common shares of the Company under the 2003 Stock Option and Incentive Equity Plan, and may
elect to receive up to 100% of their director and committee fees in common shares.

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