David is running for his life.
There was no where in the land left for him to hide.
He goes - alone - to the priest, to get some food.
6 "Since there was no other food available, the priest gave him the holy bread—the Bread of the Presence that was placed before the Lord in the Tabernacle. It had just been replaced that day with fresh bread.
7 Now Doeg the Edomite, Saul’s chief herdsman, was there that day, having been detained before the Lord.[b]
9 “I only have the sword of Goliath the Philistine, whom you killed in the valley of Elah,” the priest replied. “It is wrapped in a cloth behind the ephod. Take that if you want it, for there is nothing else here.”
‘Saul has killed his thousands,
and David his ten thousands’?”
12 David heard these comments and was very afraid of what King Achish of Gath might do to him. 13 So he pretended to be insane, scratching on doors and drooling down his beard.
14 Finally, King Achish said to his men, “Must you bring me a madman? 15 We already have enough of them around here! Why should I let someone like this be my guest?”
I think we call that - "crazy like a fox!"