David is Not Saul's Enemy

David is hiding from Saul in a rocky place, full of caves. When Saul and his men come after David, David is hiding in the back of a cave. What are the chances that Saul would choose that cave to use for a bathroom? David creeps up quietly and cuts off a piece of Saul's robe. Even though his men have urged him to kill Saul, he can't do it. When Saul leaves the cave, David goes out too, and calls out to Saul. He shows Saul the piece of his robe. Would an enemy have let such an opportunity go by?