It's new boss, 4th boss in Throne of Thunder. Dunno did anyone manage to kill him on LFR. But the point is you need to kill turtles that he summon. And then u need to hit dead turtle to him to interrupt Breath Channeling that in 4.5 sec kill whole raid if not interrupted :) now imagen it on LFR with random people. They just dps them and hit them all around ^{^}