Thread's a bit old but you can find the info about it here on Jhazrun's posts:
It does work on other bosses too, basically on anything which doesn't scream "Switch to blue chakra" most of the fight.
Envy apparently just had a 0.4% wipe on Garrosh
Sco is streaming Heroic 25 Garrosh.
go ENVY! GO!
you can get him!
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mfw i only realise once the fight is over that there are flying ships and not just boats
gratz! good job guys!