Harry didn't have anything like the same sort of restraint. It was the first time Neville had seen Harry's rage turn incendiary. It certainly wouldn't be the last. Especially where Ron Weasley was concerned. Neville had felt powerless to stop him, had no idea what he was supposed to do. If Harry hadn't knocked himself out, by bringing a whole roundtower down on top of himself, Neville was certain the outcome would have been  ... well, too horrendous to even think about.