She's absolutely what they're worried about here. They both saw her panicked during the firestorm a few days ago, but if she says so, he has no reason to doubt her.

With the entire area blocked off by ice, there's very little danger of it spreading any father than the lot. A swift motion of his left side. A burst of fire. An incinerated ayakashi.

And a completely exhausted Izuku, who is sinking to the slowly melting ground.

At least the fire dissipates quickly, it doesn't stick around like the ice does.

"Todoroki Shouto. Tsubomi Kido." It doesn't cross his mind to take Kido out of Shouto, or to take Shouto off just yet. They're finally finished here, they can go back to being their human selves.