Knife Defense KNIFE DEFENSE TRAPPING PRINCIPLES – NYC SELF DEFENSE SEMINAR |Part 1 Posted on August 27, 2017 by enginejuan 27 Aug In this video Nick Drossos is presenting his self defense seminar in NYC, hosted by NPD officer Joe Riley. He is teaching the principles of trapping the knife, with … LiveLeak.com – SAS – Self Defence Training.flv Apache Knife : A Way of Life