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In Krav Maga if you are using kicks vs. a knife, always use a side kick to the knee when the attacker approaches the defender from the side. If the attacker approaches the defender from the front, then kick him either in the groin, or on his chest or chin. You could also roundhouse kick his groin and follow it with a side kick to the knee after the initial advance and reposition to the side of the opponent. The most dangerous knife attack is the straight stab with the front hand. The second most dangerous is the slash, which has almost the same reach. The straight stab provides an immediate contact with the tip of the blade. The slash would involve whipping the blade into the side of the throat. We can see the intention of the attacker by the type of hold. The range of the slash is almost as much as the range of the straight stab. The third most dangerous is the circular attack from the bottom up, and the fourth is from the top down. A straight stab with the rear hand can be countered with a roundhouse kick to the opposite direction, or a jumping scissors kick to the chin like a bottom-up stab. If you notice the attacker on time, position your body in neutral position so you can have a peripheral view and also be able to control the timing. If you do not have the time, you will probably have to resort to defending with your hands. There are three considerations to identifying and choosing the best option using these three methods of preemptive attacks with kicks. First, look at your opponent’s knife grip. Second, which hand is he holding it in? Third, your options are either kicking the head or the groin area—whichever is farther from the knife in order to avoid a counterattack and a stab in the leg. Straight stabs are generally at the center but you should only kick below it and not above, as it would take longer for you to kick than for the opponent to stab. Remember also that a direct kick to the center of the body, be it chest or crossed arms, stops the opponent with its initial impact. Remember: the three frontal maneuvers are a front kick to the groin, a scissors kick to the chest or chin, and a defensive front roundhouse kick. Each one has a tactical component. For example, the front kick is tactically executed with the defender’s leg across the hand holding the knife and not the one in front. This forces the defender to move his body slightly to the opponent’s side, away from the slightly angular top-down direction of the knife. If the attacker chooses a top-down stab with the knife in his front hand, you could use the time the attacker takes to stab, executing a roundhouse kick to his groin with the leg opposite his front leg. You might also choose to do the second part of the roundhouse kick and not a straight stab, and execute only a side kick to the opponent's knee. You need to practice all aforementioned options until you are comfortable with them.
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