if an attacker has bared down upon u; thats all the energy u need to begin a response. if some one tries to lock u up with strength, then there are things u can do. an atemi waza would mostly likely help u gain the time needed to do something be it run or do technique. if an attacker has bared down on u then u know where his focus is -where he is grabbing u- a well placed atemi will help lead his mind away and follow the new path that nage can lead him on. as for blocking i dont know do something but dont get hit lol
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