Dean's companion, the older man, has been standing just outside of Castiel's line of sight. Which is not to say that Castiel is not aware of what he is doing, even if he has not been bothered to acknowledge his presence.

He catches the crowbar halfway through the arc it is cutting toward his head.

Castiel uses the bar to pull the other man in close enough to lay two fingers against his forehead. The metal clatters loudly on the concrete as he slumps into unconsciousness.

With that small matter taken care of for the time being, Castiel turns back to Dean.

"We need to talk, Dean. Alone."