This question came in from YouTube:
Ahsan Reza: Sensei, please explain gankaku
Evan Pantazi: That could take a life time... maybe one move from it... which one?
Ahsan Reza: @Evan Pantazi thanks for your kind reply. Movement 24-25 empi uke
So as we can see the extended hand does not have to be a "blocking" action, instead it can be a grappling action. Using the nerves of the neck in this demonstration to instantly weaken the opponents body to then pull the opponent into the Empi (elbow strike). The elbow is powerful enough to hit anywhere on the head and cause damage, however there are many more vital targets we can use to cause dysfunction, loss of consciousness, paralysis, permanent crippling and even lethal results.
Following actions will not be possible and or necessary if you attain the results mentioned above, however if needed, Kata flows on to cover that need. As we draw the opponent in to off balance them, or in answer to an attempted leg takedown, the knuckles can again access a nerve to cause full body weakening to avert the takedown. If they start to rise, or you wish to cause further dysfunction, the crossed hands can again be applied to vital nerve or blood targets that will cause dysfunction, loss of consciousness, paralysis, permanent crippling and even lethal results.
Anatomical targets, explanations, locations and affects...