There's a tiny quirk of a smile when Bucky's eyes widen, a swirl of emotion and a wordless I'm here. His wings flare up immediately when something above breaks, shielding from the fragments of glass, until they're both swept up and away.

To where Pierce is waiting.

He stays crouched by Bucky's side, one hand on his leg and wings shaking a little with the effort of holding them back - and then he thinks fuck it. Sam wants to pull Bucky into his arms and he does, holding him close and protective as he glares at Pierce.

( You didn't fail. And you're already being punished for it, Bucky, it's enough. )

It's too much, it never should have - but it did, and all that matters now is that Bucky comes back from it. Then they can work on making sure it never happens again.