Enynti area - back of pit
 

I've been doing some soloing at the back of "the pit" area in Castle Mistmoore (where the wolves for the shaman epic encounter spawn), and I've discovered a pathing issue whereby mobs will sometimes walk into the South wall and then warp up to the ledge above. It seems that if you cause a mob to flee when it's close to the SW corner (70, -115), they are more likely to go that way, which is disastrous.

I've seen pets wander down into the pit from atop the ledge if the player sits close to the edge. Could be related.