He almost smiles at that, a quick flicker of movement at one side of his mouth.

"When have you ever?"

Bucky glances down at his hand, then comes to a decision. Slowly, he raises it, and meets her eyes as he presses it to his chest, over his heart.

He doesn't say a word as he does so, or as he lets it fall again after a moment and turns away, toward the narrow path back out to the rest of the world.