@Jyq knowing the martial art doesn't make you a master, they probably lack the ability to use those martial arts properly, not to mention that there's still the qi (or whatever equivalent is used in this manhwa) component.
The reason why they don't use protagonists martial arts is because his martial arts are hand to hand which leaves their weakness (eyes) open and also his martial arts require the lightning qi which is even harder to achiev.
The reason why they don't use protagonists martial arts is because his martial arts are hand to hand which leaves their weakness (eyes) open and also his martial arts require the lightning qi which is even harder to achiev.