He does understand it and Bucky knows how he looked after arriving straight from a war that should have been lost. A miracle had happened and as much as he wants to be happy because of it, he's not entirely sure the cost to him was worth it.

Glancing up ahead, it occurs to him that her mission was still four years earlier than the war he fought alongside all the other heroes. He hears something in her voice besides exhaustion and his stomach bottoms out before a sick feeling moves up into his throat. It didn't take much to decide what she did to make sure that fleet stayed destroyed.

But he also doesn't want to push or force her to talk about something she's not ready to talk about, least of all with him. Someone this Daisy has never met before.

"Good," Bucky offers a small hint of a smile.