Bucky sighs heavily as Peter talks, and gives the younger man a firm pat on the shoulder. "Backpack leash is for you, pal," he replies. The train must have an impeccable sense of timing, because right then the doors open

and Bucky literally jumps out of the goddamn train to escape this conversation. (Or, more likely, so he doesn't have the time to think about how familiar it is to go from a train to an icy landscape with a bit of a fall involved.)