User blog comment:Mntldisorder/play alone?/@comment-2207030-20110326181948

As NoHara stated, once he spawns get killed on purpose. Stand on the edge of the ramp leading in to the arena and shoot him with an elemental weapon. If he manages to hit you and knock down your health, just duck down at the bottom of the ramp 'till you recharge. Elemental Shotguns and SMGs work well with this tactic. Lightning and acid work best as well.