It looks like a quick hotfix has been applied to Ruby Life Pools on the weekly reset, nerfing the 2nd boss. The 2nd boss fight Kokia Blazehoof encounter has been nerfed by reducing the damage of the Blazebound Firestorm's Inferno by 35%.
Kokia BlazehoofBlazebound FirestormInferno — The Blazebound Firestorm radiates flames that inflict 35267 Fire damage to all players, plus an additional 1763411462 Fire damage every 2 sec for 6 sec. Read more on wowhead.com