Killed by Raging Soul in soulfire bastion with immunity and no warning

I was doing soulfire bastion when i was killed by a blow dealing 9023 fire damage. I had my immunity shield up, but it seems like it did not work at all.

I also had 75% fire res (or close), but I dont know i that did anything. If fire res works the way I think it does, it means that the blow should have done around four times that damage, ie 36000.

I got no clear indication that a big hit was incoming either.

In other words, it looks like this enemy is bugged. Is it possible to have my character restored as HC?

See https://imgur.com/a/hk1YDGC

Serious issue but there is another topic on it. Damage of raging soul from Imperial Pyromancer in Soulfire Bastion - #6 by LaurVoldemort

I’m hoping chars can be restored. Dying to this on my HC druid really took the wind out of my sails for this season, sadly.