Battlescript variables...

how 'bout battle vars from var 24 to var 35? their value should be resetted, i believe... but then i wonder if i can use them in the same way of battle vars from 0 to 3...

I did a little bit of digging and I think you got it right exactly. Vars 24 to 35 are safe to use as variables that will get reset at the end of every battle. Var 24 is used to keep track of which elements are nullified by the Forcefield spell. Var 25 is used for something, but I'm not sure what. Var 26 keeps track of the number of different types of monsters in the battle. As far as I can tell, vars 27 to 35 are unused. So you could put your escape check in var 27 and it shouldn't affect anything else.

I was thinking it might be useful to expand the number of variables that get saved. Normally they get copied to $1DC9-$1DDC after battle, which is why the game only saves vars 4 to 23. It wouldn't be too difficult to expand that range a little bit if you wanted to save vars 4 to 35. You would just have to shift a few other things around. Let me know if you're interested in making that happen, I'd be glad to help.