When you start fighting Davidson, he will swing his axe three times. Dodge the attacks by holding Down
before the first swing. He will then put his head down and charge at the right wall. Double jump over him, get behind him, and follow him. He will hit the wall and become stunned. While he is stunned, go into Mach Speed and repeatedly kick him. When he holds his axe in front of him to block, run away from him. Always keep him in view. Whenever he is about to charge, he will say something about birthdays. If he charges the left wall, do the same as what was done with the other wall, except keep kicking when he blocks. When he jumps, also jump. Sometimes, he will spin around and throw his axe. Run away from him while he is spinning, then duck. If the axe misses, his desk will open and shoot homing missiles which you should kick and punch. Do not follow him when he goes on the chandeliers.