meet mark davies. he began his career working as bouncer in some of the east side's toughest drinking establishments where he had plenty of opportunities to hone his skills. now he runs tactical edge, teaching close combat and knife defense to uk special operators and security companies. come at him with a knife? the overwhelming likelihood is that it will soon be hanging out of your ass. generally these courses start, come at me with a knife and a guy comes at you like it's -- like it's friday the 13th. and pretty much nobody outside of friday the 13th in my experience has ever come at anyone like this. um, if someone does come, they're rushing at you and with multiple -- >> yeah. >> anthony: like in a manic frenzy of multiple, uh, jabbing or slashing movements. >> yes, your attacker is being affected by adrenaline and in such a state, the forebrain will start to shut down. yeah? so they're no longer really capable of cognitive thought.