Though he has no lungs, Shouto definitely sighs at that answer. Of course that's what he'd pick.

Not that he can say he'd choose something else. They can't leave this unfinished, especially when the ice won't last forever. They can't keep it trapped there until they can try again, later. So he just accepts the fact that they're going to probably have to carry Izuku to bed, after this is all over.

"You use any more ice, you'll risk hypothermia or frostbite. I can only regulate your temperature so much without using fire."