Joint and Several Liability is a legal term that implies that if an at-fault party is at least 1% for the fault for the cause of the injury then they would be responsible for the entire damages award if there is a finding of liability on that Defendant.  If the Defendant blames another Party for fault then they would be required to advance what is called a Crossclaim or Third Party Claim to recover anything back for what is eventually paid out to the injured person(s).