An Old Enemy Episode 12

Soran decides to continue seeking the truth. Ouya respects his choice and forfeits the match, thus ending the battle between them. Next is Fuu Saen and Houhou's match. Fuu Saen forfeits, and Houhou advances to the semi-finals. Finally, in the match between Fuu Shinton and Elder Ou Ai's great-grandson Ou Hei, both combatants use Kourei Kenshou. Only members of the Fuu family should know how to use the secret art of Kourei Kenshou, so how is it that Ou Hei is able to use it...?