Plane of Fear NPC pets
 

I was playing around in fear today with necro charm with a guildie. I charmed a fetish fiend and sent it on a glare lord and it's pet. A couple of seconds later charm would break and I managed to get feign death off.

The glarelord and it's pet immediately started beating on my previous pet.
Other mobs around the fight joined in and started beating on the glare lord. Eventually the glarelord gated and have no idea if rest of the zone killed it or it just reset or not.

This should be looked into IMO.

If the glare lord's AE has a cast timer on it, then it may have started to cast a spell while charm broke. In which case they don't interrupt their spells and they'll begin to attack each other. It's not an exploit or a bug, but really rare.

Faction wars!

Used to happen all the time in Lguk. ;)