i wish we had some video to compare on this. not very tight on the terminology and I didn't get to see the ba bu pai an that yu shan did though I've seen clips of mantis108 doing it.

the leaking palm is, I think, a left hand strike to the side of the head/neck done with the inside of the hand, palm up?

my hung gar teacher was big on the concept of 'drawing' and we spent a lot of time sparring with him pointing out, retrospectively, what he had done to draw me.