Secret Rivals 3 (1981)

aka’s: Xin Nan Quan Bei Tui/The New South Hand Blows And North Kick Blows/The New South Hand Blows, North Kick Blows/Northern Kicks, Southern Fists/Assignment To Kill/
新南拳北腿

John Liu stars as Shao Yu Pai, master of the “Northern Kick” kung fu (Liu is famous among martial arts enthusiasts for his kicking), 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.