DETAILS, FICTION AND DAVID HOFFMEISTER WIKIPEDIA

Needing privacy "to go to to his requirements", Saul enters the cave exactly where, mainly because it takes place, David and his supporters are hiding. David realises he has a possibility to get rid of Saul, but as an alternative, he secretly cuts off a piece of Saul's robe. When Saul leaves the cave, David arrives out to pay for homage to the king