Get more from Richard Machowicz: amzn.to/2x6bFlA Richard "Mack" Machowicz, an ex-Navy SEAL and former host of the cable-TV series Future Weapons, as well as a student of taekwondo, muay Thai, kali, boxing, Brazilian jiu-jitsu and Paul Vunak's jeet kune do, demonstrates a serious knife-disarm technique and the principles involved in this exclusive footage from the cover shoot for the June 2010 issue of Black Belt.

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