Sam raised a finger, watching the...kid? Creature? Difficult to tell. "Yeah, sorry. The defensive thing's probably not going anywhere." Because, seriously, he had a gun, a knife and couldn't recognize what this kid was. Zombie, maybe, but that was going to make putting him down a severe pain in the ass.

"But you have a point. I will, at least, listen to what you have to say." Keep the kid--thing talking. Give himself more time to sort out what it was.