The trial court properly granted defendant a partial nonsuit on its affirmative defense of settlement following plaintiff’s opening statement that conceded plaintiff’s husband and guardian ad litem had authorized plaintiff’s attorney to offer to settle her catastrophic injury claim for the $15,000 limit of defendant’s auto insurance policy.  Nonsuit can be granted on an issue that is less than an entire claim or defense and can be granted on defenses even though the defendant bears the burden of proof.