Extremely likely. I don't know any rapid way to dissociate steel, aside from a carefully controlled chemical bath or sandblasting, that doesn't involve a lot of heat. Hot steel glows, as I'm sure you know.Good question. Would breaking so many chemical bonds necessarily emit visible light? Don't know.
I might remind you, again, that the mass of steel recovered from the debris pile matches the expected amount. You can't figure it out because what you're trying to figure out didn't happen.