We've employed a slightly diff tactic the last couple of weeks which has impvoed the DPS for the kill. Basically same as normal (spreadout and one melee to off-tank the add whilst it is DPS'd down), but when last add spawns before evo it is dragged to boss where the rogue off-tanking it can blade flurry both the add and the boss. Interestingly the boss takes his normal increased damage during the evo, but so does the add! 5k blade flurries hit both. Hope this helps.
TL.
nice tip, thanks :)
Is that a bug?
No idea, but it is how it works.
TL.