Yeah, that surprised me. I was lucky too. I had one charmed for quite a while and he must have killed 6 other mobs. Well, then I sic'd him on a couple of mobs basically so he could get beaten down to near death and I'd invis at the last second and kill him. Well he breaks charm right before I cast invis and, sure enough, he summons me in the midst of the pack of mobs who were putting the beat-down on him. I got instant evac off and landed with 5% of my HPs.