He feels his mouth twitch tiredly at the joke. Some of the old Bucky remains, but he tamps down on the cocky answer. No need for that here and now. Instead, he just sighs, and watches out the window. "I can't rest." He admits, in soft Russian. "Too much I've lost." He wants his past back. He wants to remember. And at the same time, he doesn't. There's too much pain wrapped up in those memories.

He's exhausted, but he forces himself to stay awake, trained for decades to remain awake and alert for certain things. This is just one of those things.