Pretty much just the topic.
Thought I'd share.
Doesn't matter if you have agro or not, if you need to be taking stacks or not, last phase alone makes it worthwhile. Raid taking assfucktons of damage from fist poundy thing? Torpedo forward, instantly dropping agro, heal for a fuckton of HP, roll back, and either a) click off buff if you're at 1 stack or you just taunted @ 2 stacks or b) DPS freely without worrying about pulling agro for the duration of your retreat. Having retreat glyphed is also really nice for the fight in general if you're pulling too much agro because you're too awesome.