while searching through the cast, I noticed that Hung Yan Yan (Xiong Xin Xin) is not credited. he appears as one of Ng Man Tat's henchmen during the gameplay.

In the scene Ng Man Tat is stabbed is one actor who looks like Xiong but it is not him.
I've seen that stuntman in a few more movies and also thought first a few times it is Xiong.