In Laurenzi v. Vranizan (1945) 25 Cal.2d 806, the case went up on appeal after the granting of a nonsuit. The Supreme Court reversed, and, anticipating a further trial, admonished that payment to plaintiff of $ 3,175 by one of the defendants in exchange for a covenant not to sue must be credited to any recovery against other tortfeasors. The court stated, "since the plaintiff can have but one satisfaction, evidence of such payments is admissible for the purpose of reducing pro tanto the amount of the damages he may be entitled to recover. " ( Id. at p. 813.)