[There's a moment when he makes a face, biting on his lip when he realizes he's scared her, but the moment passes quickly when she recognizes him... but for once, he doesn't smile, doesn't do anything of the sort - he simply looks at her, serious and quiet, and nods.]
Yeah, it is. But I don't think you're gonna freeze me. [He knows she wouldn't, just like he knows she hadn't wanted to freeze anyone, not Merlin, not David, not Steve. None of them. They just scared her, and she lashed out- or more like her magic did. He knows that, and that means he knows she might lash out at him, too, might make him into nothing but ice... but he doesn't really care.
Not when talking to her is far more important. Not when she needs someone, and if he has even a small chance at getting through to her, getting her to calm down, to stop this - what would it make him if he'd spare even a second to think about himself, in this?]