Ok so here it goes,
For those of you who have got this far on the epic questline, you have to kill a dude thats intended for at least a 10-man raid, he can kill any tank no matter what the gear with two back to back melee attacks with damage that is beyond ridiculous, which is why I'm happy to give you guys this exploit.
The first time I engaged this guy solo just to try him out he bugged and wouldn't attack me but I could attack him, however, he had so much health that he despawned before I could kill him tank spec. I tried many times to recreate the bug but couldn't. Then weeks later today I went back to it and finally figured out what it was I did special that first time, went DPS spec this time, and killed his ass.
The secret is, when first engaging the boss you want to land your first hit on him by jumping and hitting him with a melee ability WHILE still in the air. It isn't not an perfect trick, I still died a few times but I sucessfully recreated it three times (helping friends) to prove that it does indeed work consistently.
Good luck with your much easier followup to this quest and epic lootz