Once in combat with him walk up the latter then go to the little building looking thing on your left once you climped up the stairs get in a good posishun and the big cheese will try to walk thrue the little house thing but he wont he might hit you a fiew times but he will be free to kill then on his secand form go back up do the same thing this time its harder then before but not for me same thing happend but when my couzin did it with the second form he failed to do the glich but killed him a diferent way.might take you some time but it works thanks to the glich im have way of beating the game cause it would of takin longer the old and usual way but trust me it is ganna fail but try it a fiew times and it will work