Although the fight wasn't to hard to figure out here's a little more help.
We all stood on the far south corner by sarth and the tank ran around and pulled from the mountains on the opposite side. He pulled tenebron with heroic throw/taunt.
Blood DK (didn't use army)
Arcane mage x2
Ret pally (often holding the adds)
Aff warlock (didn't use doomguard)
Feral druid taunter
Resto shaman healer
Paladin and priest buff bitches
We found whenever we got a middle wall someone ended up dying so we waited for RNG to be in our favor and get double outers. Bloodlust 40 seconds in burn cooldowns at ~35% health.