He'd believed it was possible because the potential amount of energy required to make that fire hot enough to melt the steel, well was it possible with magic? If so, that would be an amazing feat, considering how hard it was for humans to get there otherwise.

He watched the flames go, and the training mats. That sure was fire in the room.

Senku hummed a moment and went over there, close enough to pull anything close enough to the mats out of the way a few feet. There. The train itself probably wouldn't burn, so when the mats did, there'd be no more fuel, and there wasn't any wind in there to catch anything else on fire. It seemed logical to him.

"That closer to what you're going for?"