Unrest undead think they should flee ...
 

but then they don't?

Never noticed this about 2 weeks ago when I was leveling my shaman in unrest, but now on my monk in here, quite frequently when you get a ghoul or skele or whatever down to the % that most mobs would start fleeing at, they turn around and run off through a wall or down a hallway for 3-4 steps, then they come back to you.

Edit - I take it back. It's less of a "they run off a few steps" and more of a "they do some weird teleport running lag glitch."