There's got to be a way to convince him he doesn't need to jump on this grenade. If anything, she's far better situated to act as Stark's lab rat; she doesn't have any trauma, recent or otherwise, from any similar situations.

But if there's the slightest chance what Stark is doing could help her get home, shouldn't she bull over Bucky's protests and just do it?

Not without talking to him, first, she decides. If she can convince she really doesn't care, that it's fine, maybe he'll feel better about it, too. "You have the comparable readings for today," she tells Stark. "Anything else – and I mean anything else – you need to discuss it with us before trying to spring it on us mid-session. Informed consent, Stark. Emphasis on the informed."