[There's the briefest of smiles as he watches the last flakes of her magic melt and disappear in the air -- it's a part of her, and he's glad to see her not trying to hide it, glad that she has it back now.]
... I know.
[To anyone else, his tone might sound wry, but Elsa should hear the unspoken that isn't why I'm here, that's not the only way to mess with us in this place. That he wants to make sure she's alright, as much as any of them can be, after everything.]
I'd be a whole lot angrier at everythin' if you'd been. [That's one of the things he can't forgive -- those he cares about being hurt.]