For the first part of this battle, use Force Repulse or Force Shield with lightsaber attacks to take him down. When he runs into the room with hot red floors, pull an object off from the wall and hit him with it before he hits you. After he is hit, Force Dash over to where he is and get some easy attacks on him. Once he jumps on to the platform with you, use Force Repulse or Force Shield and perhaps some Force Lightning. Try to block as much as possible; if he hits you he will do quite a bit of damage. Once he is just about dead, press X to start the button sequence. After a short intermission sequence you will have to battle him again, this time without his helmet. This battle is very easy. Just make sure you stay out of the air. He will try to use Force Grip on you if you are in the air and he is not stunned. Use Force Dash to get away from him and use Force Repulse to break his block. Get a couple hits in and he will not stand a chance. It will only take a few Force Repulses to take him out, even under the Sith Master difficulty setting. Do the button sequence to defeat him.