The movie opens at a martial arts school with demonstrations of self defense techniques. Nancy Yen Nan-See (as Miss Lam) is looking at the shoes some men are wearing because there has been a peeping Tom and she saw the man's shoes. Two guys show up and want to be students but initially are refused. Lung Fei tries to charm Miss Lam and she refuses cuts him down like a dead pine tree. Lung Fei does get the best line in the whole movie "Sure I said that - to get into your pants!" (Paraphrased translation.)
Story-wise there is a lot going on here that doesn't make sense even though every time a character spoke it seemed to be exposition. Despite the vague story line and bad acting and feeble demonstration of martial arts in the opening scene the movie improved significantly by the ending.
The action director, credit to Ng Tung-Kiu, made an effort to show something different and realistic with the fights. One example is when the karate guy gets into seiza position and takes on the kung fu challengers. There was also ground fighting and submission holds in the fights and this was rarely seen in 1973. Also some of the fight sequences were remarkably long single takes.
I rate this above average for the year and genre and recommend it for all fans of this genre. Currently the 8.5 rating here is way too high though.My original review from 2015 was updated after a second watch.