So now the boss start to speak. The first one who found this video was denxi and sauce. _lol? aka. charlie said that too, that they got inspired of this video.
Also this tutorial is not for 100% correct. Maybe you should give credits to the guy who told you it and he from the other and so on. I bet you was begging and spamming for someone who tell you how it works.
Also you guys don't know what your doing. If this everyone knows and everyone is using it, it would destroy the whole game, because it can be just fixed if they remove the "moving on players head" or if they fix every wall in every map :s