I've found two write-ups, one saying stay in melee as the ranged attack sux. The other says, stay in ranged as the ranged attack is easy to dodge.
Well, staying in melee means it'll knock you back, far enough that it'll do it's ranged attack and you literally have no time to get out of it as you have to stand-up first. Seeing as I'm a guardian, how the hell do I stay at ranged to kill it, if I can't even dodge it's ranged attack? How can I stay in melee if it keeps knocking me back, then range attacking me, bringing me to almost death. Rinse repeat, abilities are not off CD to heal back up.
Oh, run away for a second to heal? It resets. The worse part is, even the bloody WIKI says it's an almost IMPOSSIBLE FIGHT, because it PERIODICALLY RESETS?! What in the actually......