Basicly if you have an enemy that can achieve a higher alt than you, you'll want to estimate if your max alt will be above where the enemy can convert to level flight after decending on you. If it is above, you can estimate the best decent arc the enemy can achieve. Those three things define a safe zone where the enemy is simply unable to put his guns on you. In ropes, loop fights, stall fights, ect, you can use this zone to your advantage. Much of the time, but not always, it involves the enemy stalling at the top, so I look at it in terms of the altitude they can recover level flight after a stall. Hence LFRA.
In the film posted here where I refered to it, I initially got him to overshoot with a barrel reversal. To counter that, he made is second pass at a slow speed. My answer to that was to give away the shot, and charge right through his decent arc into the safe zone. Because of our relative E states, his choices were limited from that point on.
