First he pulls the shirt off of his head and sets it on his lap. He'll worry about who he wants to worry about and right now it's Kido. Especially when he notices her starting to shake.

Izuku's seen Shouto catch fire many times, he's seen him frost over even more often. But for Kido who's not used to a world full of strange quirks and is terrified of fire... Izuku grabs one of her hands with one of his. "He'll be okay." She doesn't have to watch either.