Chasing the coward

To be more precise, i don't wanna target one running character in particular: it's just enough that the enemies are aware there was an attempt of running away... starting from that point they become wild 'till the end of the battle, now i wonder if it's possible to deal directly with running away code... anyone knows where's the code that handle escaping from battle? i might editing that, when the code is triggered, it also sets one battlevar bit(one variable which resets after the battle) and so the enemies have in their AI a check on that battle var bit... souds good?
It appearently seems the easiest way, i believe...