I watched your vid and I don't know what has changed but this is not doable anymore.

I get to phase three use the staff and still and conflagarated and arcaned blasted all over. my 340ish team of 3 ele shams 1 resto druid and a pally tank get owned. I cannot kill the mage fast enough and then the others are fearing silencing and all sorts of stuff the tremor tots dont even work against it. I pop bloodlust just on the mage pop raciials and mastery i cannot get off one round of lava burst crits and a lightining blot before i am confalgarated and blasted back. The staff doesnt even work as far as im concerned. I grew bored with it after 6 attempts and left. A mount that probably will never drop is not worth that headache. I dont even know how you kill the mage that fast because she would have blasted you back and confagarated you in about 2.9 secs after she became able to aggro on you. They changed something.