Originally Posted by
Herbnosis
I don't think it's been said yet, so I apologize if it has and I missed it.
Phase 2 lasts three minutes (according to the video or another post), but Phase 2 will end "prematurely" if the last pillar add drops to 30% of its health (at least on 10 man). If you're doing well in P2 and want to push another crackle, keep in mind this limitation.
I accidentally posted this in the H Nefarian thread first, and apparently this is NOT the case on Heroic--once one of them dies, P3 starts. However, on several attempts in normal, we killed two of the platform adds and kept the third one up to push another crackle.