Clint grits his teeth as he shoves his hand into the acid, feeling the immediate effects as it starts to eat away skin, bone, and everything else. "Really strong? Come on, Cap, I might not be a super soldier, but I got th-" He breaks off to hiss because obviously, an acid bath hurts like hell. "Don't care, though, we're getting you outta here."

He has to force himself to keep moving his already damaged fingers, because the key's in here somewhere, and if he wants to get Steve out, he has to grab it.

"Hang in there, it won't be a minute." Is he saying that to reassure Steve or himself? Who knows.