Not sure if this is a bug or not but i just completed a Quessvala? event (giant spider that drops down after you snuff out 3 torches in the Dig) where 2 of her spawned into the fight possibly a bug maybe not.
ive only done this one about 4 times before so i may have been lucky up until now and not seen it either way its a nasty fight massive damage and the stun locks- cause they were tag teaming with the web shot thingy to stun my healer. That fight sent me scarpering back to the inn 
