There are two steps to defeating him. (first step) first you will have to sky dive onto the arena. Dodge the missles. (You can just go in a circle.)Then when you get to the ground, start shooting at him. When you get enough dammage hell fly to the way other side of the arena. You can either fight all the enemies or use your boots to zoom across really fast. When you reach him, start shooting at him again. All you really have to do is lock on him and run around him in circles while shooting. There is life and crates on the outside of the arena. If you need more help you can contact me.