He listens in silence, to the point where it might seem like none of what Arthur had said actually registered. But Bucky is just processing. He's familiar enough with barriers that only certain people can cross. He didn't see any evidence of that kind of familiar tech when they went investigating though. And he's not really sure what the hell the three of them were thinking. Did they think they were going to find the answers to everything as soon as they rolled out in a delivery truck?

"Did you learn anything crom the driver then?" Bucky seems wholly unconcerned about the torture talk. Like it's a normal part of their existence here - which it sort of is - and it's a fairly uneventful thing that happens to everyone.