And then I went and took a group of people and I took a knife and I attacked each of them and I photographed them. And I retained their first move, and I found that for certain, if you really attack, nobody stands there and gets the knife. He does something to protect himself. He doesn't attack you, but he substitutes an arm for the head, the throat, the back. If you try to hit somebody, you will see what they do; they won't stand with arms down, facing you, defenseless. When you hit them with a stick, they will turn their backs toward you and protect their heads and let you hit them on the back. And therefore, most people, even in the movies, when they show people hit with sticks for punishment, you will see they will always let you hit them on the back. And the back, it's painful. But it is not dangerous, unless, of course, you break every bone, which is possible. But even if you break his every bone, he won't die, he will die later, but not on the spot. So that was the idea, to find out what was the first movement one does. And I built a system of defense for any sort of attack where the first movement is not what you think to do, what you decide to do, but what you actually do when you are frightened. And I said, all right, let's see now, we will train the people so that end of their first spontaneous movement is where we must start. And let us see now, we’ll train them three months like we did before, give them a year off without training regularly, and then a year afterwards, try to attack again. And of course, the year afterwards, the first defensive movement they did, once they did their spontaneous first movement, was the continuation of that first movement. It was a remarkable thing. Most of the people knew what to do immediately without previous notice. They did it, and I was as pleased as punch and, of course, I got another few guys in the Haganah to help me and we worked about two or three years and perfected that idea.