Watched this several times after feeling there was something incongruous. Unless I'm mistaken there are many movements where he appears to be assuming the knife has only one cutting edge. We teach standard tomiki tanto randori but have recently added knife randori similar to hwa rang do/escrima and use military style attacks similar to what Echanis used to teach (I have a senior Yudansha who trained with him in the Rangers). We use Red Knives which have a profile similar to Fairbairn's design and they have cutting edges on both sides. Adds a little more realism to it. Other than that the Systema looks pretty interesting and the flow is very reminiscent of Aikido-play.