I'd love to know the draw weights of the bows he's using. One of the differences between the sort of archery he's doing and the standard recurve competition shooting you'll see is that the latter is much slower, more relaxed, with very defined, conscious aiming. The idea is to do precisely the same thing, with your whole body, over and over and over again. His aiming is completely instinctual. Because of the way the arrow will drift away from the bow sideways if you put it on the right, I doubt it would be worth using the bow as part of your sighting at all.

On the one hand, I can believe he'd be able to do this sort of thing quite easily with low-powered bows. On the other, you really wouldn't want to be holding the sorts of positions he gets into for very long at all if they were heavier.

I'd also, just for interest's sake, be interested to put him up against an experienced modern recurve archer at, say, 40 metres. Close range trick-shots would, I suspect, lose out to more refined technique over much more than that.