I think it's an obvious bug, but I'm wondering if anyone's experienced it.
The 85 rogue jumped a 90 hunter who was at 100% HP, knocked off 90% in the first 2 GCDs.
I asked him how he did it and he just said "I used sinister strike".
I could only inspect him for a second, but nothing seemed out of the ordinary.
MH looked like a blue mace ilvl around 395ish.
Hunter was in full PVP gear too.