Battlescript variables...

The subroutine at C2/30E8 gets called at the beginning of a battle, and then again if the battle changes (like SrBehemoth or final Kefka). Maybe if you kill the SrBehemoth and then die during the GtBehemoth, it will save your progress so that you will only face the GtBehemoth the second time around. That's my guess anyway. I've never tried it. Or maybe the whole $3EB9 thing is redundant.

You're right, the M-TekArmor battle does also set one of the bits in $3EB9. I don't know why. It seems like it wouldn't have any effect.

I don't think you will have any problems if you use bit 7 of the monster variable, as long as you are not using Seize.