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I don't see why this should be a problem at all. He's not teaching the werm, the actual teaching takes place with the finial display of the werm. So you could only do this if you knew how to do the werm in the first place. If the finial display is of his own creation, then I can't see a problem.
About the display itself, i'm not really all that crazy about it. Looks like Lethal X with a stiffy, but I always try and find use for everything, so thank you because somewhere down the road, I might look back on the motions you used to get into this and it might spark something creative for myself. (Hell, it's happened before.)
things i look for when wanting to learn a display flourish
2.) the packet positionings
3.) if its a werm with a chin extension and/or an extra packet between the pinky and pointer, i'll kick something
its nice you want to share your work with everyone. but try for originality before posting another tutorial. a new concept perhaps.