While killing some more ogre guards I noticed that even if not in combat yet, if the npc was moving prior to being rooted this bug can be replicated:
- Bouncer Hurd wandering along patrol path (not aggro'd) > casted root > DoT DoT > Hurd's health drops 3% per tick.
- Bouncer Hurd wandering along patrol path (not aggro'd) > casted root (resisted) > he gets into melee > re-root > back up DoT DoT > Hurd's health drops 5% per tick.