Knife fighter? i'm not scared of a knife fighter,i'm scared and train against a knifer.Big difference, so is learning simple retainable skill sets and PRACTICE.train at a level of realism. i'm not gonna comment anymore. i've had exstensive Real triggertime as a Operator+did Eod work in SEASIA. Where we had bandits KnR and robbery.Krav was an essential part of my survival strategy,i'm still here.seen many a bad dude.Didn't fight to win,Fought to escape/survive