Non demonstrator of ushiro techniques (ryo kata tori, te kubi tori, etc.) should lost visual contact with his attacker, bcz he can hit his neck for behind otherwise. See the Founder's videos instead!
To people that said that they cannot fall without been touched, may I ask them, why do you fall when you do a false step? , did you never slide? , what happens if somebody guides you to the fall? does he need to touch you for do that?, if you learn to redirect the attacker, and the attacker knows...
Non demonstrator of ushiro techniques (ryo kata tori, te kubi tori, etc.) should lost visual contact with his attacker, bcz he can hit his neck for behind otherwise. See the Founder's videos instead!