[He watches the fight with interest, because he's never really connected the angel with any kind of real violence, but this? Well this is different, puts him in a different light. The girl runs off and he follows her with his gaze for a moment, but then Cas is talking to him and that's probably more important. He clears his throat, adjusts his glasses, and smiles tightly.]

Yeah, I figured. Geez, man. I didn't realize you did the whole...avenging angel thing too. What was that last thing you did, where you poked the guy and he passed out? That was pretty fucking cool.

[Yes, he's really more interested in the fight itself than what it was over.]