Here's a few observations:  If you find yourself in this position (two guys each holding one of your arms, a third coming at you with a knife) you're going to die. Especially if you're an obese, out of shape woman and are being assaulted by three men twice your size. This particular situation is so outlandish and unlikely that you may as well offer advice on what to do in the case of an alien or werewolf attack. 99% of self defense situations happen too quickly for you to set up a proper response. What if they knock you down? What if the guy starts stabbing you before you complete your spinning moves? The idea that you're going to execute a spinning parry, counter combination that results in you disarming the knife wielder and killing all three of them in one motion isn't remotely realistic. This is like a fight choreographed by a 12 year old that watches too much anime or action movies. This is self delusion not self defense, pure fantasy. Anyone who tries to sell this as instructional is running a con, plain and simple. If someone is attacking you with a knife, run. Get away from the knife. If two guys are holding your arms, and a third guy is moving in to stab you, offer to suck their dicks. Offer your wallet. If you want to survive offer them whatever it is they're after. The odds in that situation are so immensely stacked against you, unless your plan is to die fighting try whatever you can to de-escalate the situation.  Easy to test though: get three friends together. Guys of decent size and strength, have two of them each hold an arm. Take the knife out of the equation. Have the two guys holding the arms really hold them, no bullshitting, no just standing there posing and waiting for your scripted escape moves. Have the third guy start punching you in the guts until you manage to pull free. Spoiler alert, your buddies will stop beating your ass from being tired before you manage to escape, much less mount a successful series of counter moves. Even if you're a guy around the same size/strength as the other three. Even if you know "martial arts" and they don't. This isn't a movie, you aren't Neo.