The Eagle Fist (1981)

Captain Lau Si Chung (Chi Kuan Chun), realizes his kung fu isn't that good when he gets beaten by a weird old man (Cheng Kei Ying). He goes off to a temple to learn from the old man. Once he becomes proficient, the old man tells him that his master was killed by a Bandit known as "The Red Dart." Lau Si Chung then seeks vengeance & a book on nerve-lock reverses that was also stolen by The Red Dart.