That is pretty neat, I would love to see a video of this. Can only the top level guys do this, or can most entry level people do this? I guess I'm asking if this is common or high level.
How pure it is, depends on the skill level of the person demonstrating it. I would say in the grand scheme of things it is very low level.
I will try and get some video for you.
There is a second method too, and I will take some video.