Robin turns his look on Castiel in turn, the narrow-eyed disapproval of a cat; superior but quiet. He's not going to let that first bit pass by entirely without comment, although he's much more interested in the substance of the actual conversation.

"I've got your permission to stay, how lovely I was here first, you know. You're welcome to leave is what I should be saying."

He snorts, but presses off of the doorframe to stand upright, arms still folded over his chest but expression evening out. "You call it an episode like you got a case of the vapors. Are the both of you unharmed? For now?" he asks, unable to disguise a thread of honest concern. Castiel's situation ... reminds Robin a little too acutely of what had been going on with Caliban, for some time, in a way.