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Monsters bugging at 1 HP
This bug is kinda sorta annoying. You are clipping along and get a pack of mobs low and then they just sit at 1 HP. Has happened a few times in a few greater rifts I have done. Heartbreaking to get a rare/elite down to 1 health and watch it just walk around you. I have yet to see it happen on a rift guardian, but seeing it happen so frequently on mobs makes me think its not beyond the realm of possibility
Edit: I play a WD, apparently it is happening with Wizards's as well http://us.battle.net/d3/en/forum/topic/20418872890#1
Kauza
We just pushed out a hotfix aimed at fixing this. It should be isolated to Wizards / groups with a Wizard in it as mentioned here, but let us know if you're experiencing something different.
http://us.battle.net/d3/en/forum/topic/20418872890#9