Exactly, re: Tunny being angry. It throws Brad at first, because he's as sullen and defiant as he can be without outright defiance of orders, and it seems incongruent with both Brad's memory of Nate and Tunny's desire to *do* something, to make a mark and find his niche.

IDK, Stark's Tunny seemed physically more tense that the other characters, just from his posture and the set of his shoulders, esp early in the show, but I didn't necessarily get "angry" from the performance as much as I expected from reading his comments about creating backstory for himself. It's useful for fic purposes, though. :)