another bug, the skull cant attack when you hit it fast enough, just keep attacking him and u can get him before he has a chance to cast firebals hope that helps people get the achieves.
hey i figured out a bug that makes it much easier, when he does the laser get behind his head he cant hit you and u can easily hit him and get a very good combo on him while he just stands there laser'ing, also he does the whirlwind when u stand on on him, so always be on the side of him, if u stand just in range u can evade his bear attack too