For me it's his face right after he's said it and sinks back - damn it, Bucky Barnes remains so many of my favourite character tropes all rolled into one. I also really liked Sam's "You finished?" after that. They spend so much of the time snarking and being annoyed at each other, but those two words, they were said kindly.
I think they're doing a pretty good job of selling the frenemy angle. Yeah, they aggravate each other constantly, but there's also the sense that they do have each other's backs. When that cop asked Bucky whether Sam was bothering him it would've been easy for him to j