Kai versus Mizuki (who is a witch) in the final battle scene, which the latter becomes a Dragon and put up a heck of a brutal fight against Kai, nearly killing him quite a number of times. Kai wins in the end though.
- Heck, even the heated exchange before the fight scene was awesome:
Kai: I know what you are.
Mizuki: You have no idea.
Kai: I am not afraid of you.
Mizuki: You should be.