Delirium "That didn't happen" ascendancy

I’m playing as a Pathfinder using Petrified Blood, Progenesis, and the "That Didn’t Happen" delirium ascendancy. While mapping, I was hit by about 5–6 Volatile Dead orbs. I initially survived thanks to the combination of the ascendancy and the over-time mitigation effects from Petrified Blood and Progenesis.

However, about four seconds later, I died from the ascendancy’s aftereffect — the 40% of the initial hit that gets removed from life afterward. The issue is that this aftereffect dealt more damage than the original hit itself.

I have around 6k life/sec recovery, that did not help.

Shouldn’t the ascendancy’s effect be calculated last, rather than first?