Said before that he didnt jump, just teleported to the middle IMMEDIATELY AFTER the last nail was hammered down, then did a hellfire for enough damage to 1 shot most of the people there. If it had been us doing too much damage to him, the hellfire would have killed everyone for max damage, and nails wouldn't have been brought down. The head of the dev team has even said it himself: the fights are not working as intended, and will be removed/replaced by ones that do work as intended in 2.0.