What the heck is this?

[Nihilanth]

140k hit through 20% damage reduction (pvp set+iron hawk)?

[Siphix]

I didn't know that kind of damage was possible still

[Deleted]

Natures Vigil Bug.
http://eu.battle.net/wow/en/forum/topic/12989621273

[Thelxi]

The druid probably got a nature's touch (100% increased from pvp set) healing touch crit on something low level, it scales ridiculously. He could have healed anything from a low level player to an npc.