And this is what I tend to teach Law Enforcement Officers in brief workshops. Usually they have been taught by their training officers or by other workshop teachers the same old useless methods of self-defence like the old X block against knife which will get you killed, or to use locks and holds to try and control the attacker which will also get you killed, or they are told to grab the arm that is holding the knife, or they are told to use a sleeper hold, which is all going to get you killed!