On the 2nd boss in MtG there are lighting orbs that spawn ever 15% health lost from the boss. Two of them spawn one on his left one on his right, you must kill them quickly before they nuke your group; but once you kill it you get a debuf that dose damage ever second and increases damage by 50%(this buff dose stack) this buff may seem helpful but thats wasting your healers time/and mana by healing you.
The bug i found is that if a ranged(mage,hunter,warlock ect...) kill the lighting orb(s) and then stands between the wall and the candle on either left or right side this debuf will instantly go away, now if you move away from this place you will get it back but you can take it off again instantly.
I did a Heroic MtG pug with some noob dps that kept dieing to this debuf after i told them this "strategy" we killed him w/o a problem.
Ohh you still have more then enof range to attack the boss no matter what class or what spec(imp range on spells)
Hope this helps anyone tired of wiping on him, hardiest boss in MtG for a pug in my opinion.