Help! mages not casting spells I ask for in battle

[TheBigBlueBox]

For some reason, I script my mage (in this case, my pretender) to cast a certain spell in battle.

Sometimes it works, but I tried falling fires and fire storm and the spell won't cast. The mage is capable of casting it and I do have enough gems (on the caster's person) but it won't cast the spell. What's going on?

[Shovah32]

There could be a range problem or (in the case of fire storm) the mage may decide its not worth casting.

[Twan]

Sometimes, for spells like fire storm, your mages consider it's better to save the gems if the ennemies look weak.

They may also be affected by the tactical ftaghn, a disease affecting numerous creatures of the Dominion world, created by secret worshipers of a god from R'lyeh.