Earlier today, Blizzard nerfed the glaives in Phase 1 of Mythic L'ura and now, it appears that another hotfix has targeted Phase 3. We aren't exactly able to datamine exactly what this hotfix does, but we do know that it targets the Dimension Link ability. This ability makes is supposed to make all damage done to one copy of L'ura transfers its damage to the other copy of L'ura.
When comparing Liquid's pulls before the hotfix and after the hotfix, they went from 3.2% damage to 6% damage in the same 30 second window (from the start of the split phase to ~30 seconds later). While it's entirely possible that they changed cooldowns around, or just played better, having their raid damage almost double seems like a massive increase.
Since we know that a hotfix has targeted the damage link, it's possible that there was a bug preventing the damage from being shared properly, which would have lead to the increase in damage.
We know that Dark Archangels now have a 53 second cooldown on Mythic difficulty and unless anything else changes in the fight (Secret Phase?):
The first Dark Archangel occurs at 6:30
This makes the second Dark Archangel around 7:23
The third Dark Archangel at 8:16.
And the final Dark Archangel which should have no more Crystals at 9:09
With a final 6 second cast, this would lead to a hard enrage of 9:15 if nothing else changes.
