He changed his behavior before them, and feigned himself mad in their hands, and scrabbled on the doors of the gate, and let his spittle fall down on his beard.
So David's saying, "I'm a CIA agent, I'm on a special mission for the king, and nobody knows about this special mission. It's just a secret mission that I'm on for King Saul. So my men are over here, and I need some bread for them.