I think in a live setting, with a guy itching to defend himself, right before he goes under (Dmitri's pic), the attacker would either lower his left elbow and back up, or lower his left elbow and grab his back collar with his other hand, or hit him, or something.
I have a few pals that do Aikido. Ive spoken about push hands with one of them, and he said its a bit of the same thing as his technique training...you dont use it like that in real life. You just learn where the leverage is, yours and the uke's, and learn how it works. Of course, i never ask them if they try to train the real ones...i know the answer.
Man carcass in alley this morning...