He raps on the glass again with an amused smirk, but doesn't outwardly tease him for the sound. It's moments like this, where it's easy to catch Dean off guard that makes him a little nervous for the man's safety, but at the same time...well, he's a little relieved Dean's not as fucking paranoid as he is.

"Yeah." He answers, and he'll leave Dean to do whatever it he wants to do, and go check to see how badly Baby screwed up his game.