Hi Jeff,
From what I have seen of Hak Fu Moon, I have seen some videos, I think it was you that posted them a while back... To me Black Tiger definitely was a southern art ... and I could see the use of stance and hands similar to Hung and the many offshoots...
Pek Kwar is a northern art, and Kwan Tak Hoi exchanged with many masters... Gene Ching put a nice article about a form in their curiculumn where your hands are tied together... Apparently, Kwan Tak Hoi met a descendant of Wu Song mountain who is related to a legendary hero who fought off opponents with his hands tied... Alot of groundwork, Kwan Tak Hoi's Day Tong was pretty good, so he was able to learn from this other master, and passed him some pek kwar sets...
In the black tiger in their style I see some double tiger strikes at the collar bone area that i dont see in the hung stuff usually, CLF has this way of striking, I may be wrong and Hung has it too... But the direction changes I am referring to are striking and stepping in while changing the feet to the corners...
When done at normal speed it seems to have some stomping, charcteristic in some northern styles...
Also if I remember correctly... there was some jump and spins... To me I would say its definitely Northern... I will ask more and try to get some info for you Jeff... I know you are into Black Tiger so I will do my best to get some info on this particular tiger for you....
Take care...
Joe