No need to watch the real film. This trailer is good enough.
It's like every ninja movie (and there are nearly a hundred) produced in the 80's by Joseph Lai all take place in the exact same forest clearing. Just watch any ninja movie trailer from this time period and you will recognize the exact same spot in the forest where two rival ninjas must fight to the death on overexposed film stock.
The Joseph Lai films are becoming some of my favourite trailers.