He meets the doctor's gaze levelly whenever McCoy is looking at him. He can tell the man is putting forth effort in a situation that doesn't make him feel at ease, and Steve respects that. He hadn't considered other alternates showing up here, but why not? If a female doc appeared, their roles could be reversed.

"No, it's fine," he says, shaking his head. "I'd rather know now so I don't look like an ass later. You're, um. You were looking out for her. I respect that."

He nods almost imperceptibly. It's ... good. Steve rubs his face, and holds out his hand as a sign of respect. "I won't turn down any help if you can give it, doc. I'm a little out of my element here."