Bucky had been a little quiet, a little twitchy before now, but there's something in the shift in his voice when he mentions HYDRA that gives Peter some room for worry.

"You can always ask him," he suggests. Maybe Steve wouldn't show up here, but Bucky could always ask him when he went back.

"Hey, did you want to get some water?" Peter asks, suddenly. He's sure that it seems like it's coming out of nowhere, but he really is worried and he's not sure what else to do.