The Secret Rivals 3 (1981)

Sinopsis

John Liu stars as Shao Yu Pai, master of the "northern kick" kung-fu, still seeking revenge for the death of his brother. Evidence mounts that Lu Tung Chung (Alexander Lo), master of the "southern fist" kung-fu, is the culprit. What Shao doesn't realize, however, is that the true villain is subtly manipulating both the martial artists behind the scenes, hoping to force them into a confrontation and have the dirty work done for him.