So this isn't really a bug, but just wanted to post this interaction here in case it wasn't expected. Anyway, so I was playing with all the challenges on (as a berserker). Pretty much every fight required me to be right on top of any enemy or they were completely invisible and not even visually rendered.
I was playing around in the beast of winter area and got the footsteps of the beast (which pulses that aoe hobbling effect). I did a real noob move and turned on rage near the end of a fight (with the boots on), at least I thought it was the end. Apparently there were archers around 5-7m away from me on either side of the fight, so I couldn't see them or their arrows except for the damage numbers occasionally popping up. Needless to say, that aoe hobbled the **** out of me and I got 3 wounds or injuries or whatever you want to call them in a couple of seconds and KO'd myself (mostly because I couldn't find the archers and I was slowed).
After metaphorically facepalming myself into the 34th century, thought it would be worth posting here for a laugh.