Low health NPCs run at full speed while feared
 

As title states, NPCS that are below 20% health (I've seen this at 1% health, as well) and are under the effects of Fear, will flee at full speed.

Once fear wears off, they instantly slow to the correct speed.

I assume this is a bug?

Yeah, it is a bug. I think Fear got caught in the crossfire when they increased the run speed for all fleeing mobs. Sounds like they are working on the flee speed.

afaik, Fear should be an exception to any Flee speed changes.

Checked this out on live and it seems like you are correct. Fixed, pending update.