When I was playing recently, I was doing the Kill the Shadow Druids quest. I had Jaheira in the party but I forgot to rest before I went in, so I was hurt with only a few spells. Started fighting the SD anyways. The Shadow Druid starts with some spell, and the only one I had left was dominate, so I did it.

I converted the SD to my side. Since I still had to kill her to win, I had the SD cast Heal on me first and do it again to waste the other one. Then I had her cast all of her summon spells. Since she was on my side, all of the summoned creatures had green circles. There were 2 bears, a nymph, and a fire elemental. Just then, she went red. However, all of her creatures stayed green and started attacking her!

All the shadow druid does is try and attack Jaheira. So I had J walk around and try and keep the creatures between me and the Shadow Druid. The creatures just kept wailing on her until she was dead. I ended the battle fully healed.

That had to be the funnest victory so far!