The whack on top Bucky's head was enough to get his attention this time and Steve sent Tony another agitated look. He was getting through with Bucky, at least somewhat, and Tony had to go do that. Couldn't they just have one moment? He hadn't been able to talk with Bucky like that since he got here, so the interruption put him in a sour mood.

Also, completely unnecessary what he did.

"What is it, Stark?" Yep, Steve was definitely irritated.