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I recognize the Snake fist, but haven’t seen the Blood fist form before.

This is from a 1991 seminar in Connecticut.

Martial artist and author Jason Brick has been doing an informative podcast on many topics related to self-defense beyond the typical ‘here’s a couple of techniques’ angle. I recommend that you check out the trailer, and maybe head on over to YouTube to subscribe. He’s got some heavy hitters in the field for guests, and covers some topics that might be helpful if you teach self defense.