This is good. He has some good ukes.
I've never had the pleasure to pratice with him, but if thos techniques are sound (as in holding the attackers hands/arms), the attarcker will get sprained/broken wrist/arms if he dosen't move. Some of the them more suddel than others.
Some of the techniques demoed, I think, are just for showing principles and others are for the "real thing".
It's a nice demo and I would love to work an them as "in real life".
Than you for sharing, it made my day better ;-)
/Yari