WoWDB

When fighting Feng, alternate Nullification Barrier and a Lightning Fists stun stolen with the other tank buff to fully avoid Epicenter's damage. Use the Nullification Barrier in phase 2 on alternating Draw Flames (cast it on the boss's feet) to minimize the boss's stacks. Try to time the 33% transition so that it comes after a Draw Flame mitigated with Null Barrier-- if your raid has the damage  Null the 1st and 3rd draw flame, otherwise, let the 1st go and Null the 2nd and 4th. In the last phase, you can cast Null Barrier in melee for the stack during Arcane Velocity, but make sure your raid spreads back out quickly afterwards, as he may immediately apply an Arcane Resonance.