Hit him once then he will split into 4 parts. Stay out of the way so they don't hit you and get something to throw at one of them. There is a certain one you have to hit. It will come up and the one you should hit will glow. Then it spins around so it mixes you up. Keep your eye on the one that glowed. When it comes back down hit the one that glowed. Keep doing this skill over and over until you win!