Nope. Look at what I said again.
Once jump on top of the guy and keep beating him, you're no longer "fighting back"; you're the aggressor. And yes, at that point the guy can shoot you to defend himself.
All that means is that you just have to push someone far enough, let them get the upper hand, and you can shoot them. That you don't see this baffles me.
What if the victim of a rapist turns the tables and starts winning, can the rapist legally shoot her?