I wanted Damien's fireabilities to have some sort of method of working beyond him just sticking his arm out and shooting fire. For all intents and purposes, that's basically what he does, but I like the idea that he ignites some sort of gases that he's able to expell from his hands.
I'm not entirely sure where those gasses are coming out. I guess from around his claws? Ew. And he did just sorta shoot a spark out of his palm. It would probably make more sense if he was a fire breather, though it would've looked a bit sillier.