John giving his own words on the matter gives Arthur time to pace - he knows his own kitchen well enough not to crash, at least - and the motion, the doing of something beside stewing in his own head, helps a bit. Helps get himself on a more even keel, even when Bucky pushes back on- on the wrong fucking point.

He turns towards the soldier's voice. "Bucky, I don't care about how you lost it. That isn't my business. But-" he sighs heavily, running his hand through his hair. "Look. Everyone else knew that it was missing. It doesn't matter how it happened, but they look at you and- they know. It's obvious."

He lifts his hands in a helpless gesture, and lets them drop. "Do you understand that everyone not telling me something that visible can completely hamper my ability to plan, to- to believe that people are telling me everything, anything, when they couldn't even tell me that?"