One thing about BQL 25HC change that I think people fail to understand is the scale of the enrage timer extension. Let me elaborate:
- You burn the largest portion of her HP during the last phase, when 16 people in your raid have been bitten (double damage). If you hit enrage timer on previous version (~5:05), that phase would last about 30 seconds.
- While progressing, you have to 4-heal this fight, which means you have 2 tanks and 19 dps. At this stage of progress of an average guild, you have some people doing 13k+ dps, most of them sitting there 10k, 11k, but let's assume for easier calculation that average dps of a raid member is 11k (it is more). If 16 of your dpsers have been bitten, and 3 haven't, that makes it 16x22 + 3x11 = 385k dps. Add bloodlust, cooldowns, execution phase, pots and tank dmg, this will easily rise to at least 450k raid dps.So, a minimum of 450k raid dps with 16 people bitten in last phase.
- 450k raid dps means that in previous version, you would get 450k*30=13.5m million hp of BQL down in those 30 sec (it's closer to 15m-20m in reality). If you extend enrage timer by another 25 seconds (I'm pretty sure new one is 5:30), that means that in last phase you would down 450k*55=24.75m hp (also, in reality, that would be closer to 30m).
- The difference of last phase damage output (24.75m vs 13.5m) means that the enrage timer change has nerfed the boss by another 11.25m hp, very rough calculation and probably inaccurate but you get the picture, feel free to correct me if I'm wrong. So, instead of a 3.6m hp initial nerf, this feels like a 14.85m nerf of a boss, or a 19% hp nerf.