Knife Fighting Training Elite Gun Fighter vs Elite Knife Fighter | Ep3 | The 21ft Rule Does Not Apply! | Posted on September 3, 2017 by enginejuan 03 Sep The 21ft rule states that in close quarters combat a knife is more effective than a gun. That a knife wielding attacker needs only to enter a 21ft radial distance to … KRAV MAGA: Knife Defense Series – Knife Slash from Above Preemptive Counter Attack HaganaH Carjacking Defense