AI sometimes spams defensive spells
Try to attack anyone on "Balmora, Guild of Mages".
You may notice that Masalinie Merian sometimes casts "reflect" repeatedly, even if this spell was already casted a couple of seconds ago, Ajira spams spell absorbtion.
I also tried to add "bound longbow" spell to Missun Akin. He casts this spell three times in row before starts to use a summoned bow.
I think there is a bug in aicombataction.cpp - rateEffect() does not check if actor already has the same effect.
(RM-3855 from redmine: created on 2017-05-02 by Andrei Kortunov, , relates #3406 (closed))