Luk Siu Fung and Fa Mun Lau survived their final encounter with Fok Yau through good luck. Fortunately for them, the master engineer Chu Ting was also locked up with them at Fok Yau's pavilion or they would have starved to death there as Fok Yau had threatened.
If Fok Yau had actually succeeded in killing Luk Siu Fung and Fa Mun Lau in this manner, however, would Sai Mun Chui Sheut have eventually avenged them? Or, given SMCS's personality, would he have decided that it was none of his business?