Castiel's eyes start narrowing dangerously during Derek's rant, quite certain that Dean did nothing he himself would not have done and rankling at the idea of Dean being dressed down for anything before they are perhaps mercifully interrupted.

Castiel stumbles along behind Dean, keeping pace until they enter the hotel and he pauses long enough to manage a quick, "Room!" at Derek, in hopes that he will understand to get them only one before he's hauled bodily into an empty restroom.

He raises his eyes to stare at Dean's tight jaw, trying to gauge how badly he has handled this. "I'm sorry for what I did in the bar."