Although it seems impossible (for most gamers, anyway) here is how you beat Spike. At the start, ram the red balls Sgt. Byrd drops down into the arena at Spike. After about 3-4 hits he'll crack the floor. Then Sgt. Byrd will start dropping red and blue crystals. Red=1 shot superflame powerup. Blue=a bomb. Use these until Spike is dead.