I also heard other stories of Hwang Jang Lee in Vietnam, also that in Hong Kong in 1977 he was involved in a publicized challenge match with Cheng Ki-Ying, then a full-contact champ in HK. The bout never happened, as Cheng's wife was afraid Cheng would get hurt. Hwang is definitely one of the genuine old school martial artists who were in KF movies.

I heard many years ago that Gordon Liu was attacked in HK by a group of about eight men who tried to rob him with "chopper" knives (probably melon knives or meat cleavers). Although he was injured, he supposedly successfully fought all eight men off. (I read this in a British(?) magazine when I lived overseas).
Jim