Chasing the coward

Hi!

I wanted to try planning some smart AI for some enemy, one in particular is targeting and attacking with stronger attacks the party, when they're trying to running away from battle.
i dunno if exists a way to detect right the running away animation as a status or something, probably not, yet i might try to count at the start of the battle how much allies are there, and then if they suddenly are lower than the starting number, i might assume that someone managed to escape and so trigger stronger attacks.

The question is... how to do that, without exchanging one dead / in air ally due to jump for someone out of battle? (ran away, sneeze and engulf should be the same status)

Besides i realized some time ago that it's possible to target an ally, while above the sky in jumping animation, i wonder if there's also a way to detect that he's actually jumping and not just target all allies just to be sure to hit the jumping guy...