earlier tonite, im trioing unrest (brig, inquis, conjie(me)) and we get to the festering hag. and this is what we got:

note: i was at 100% gear

i had stoneskin and did not take any damage...but i still took the armor damage(above)
here is an ACT chart of it:
the second we engaged it hit and insta killed brig and inquis, i had the stoneskin and didnt die, then it reset.
so, im thinkin i get smart, and i drop grp and gunna stoneskin myself and save death on pet. then have other 2 help kill it out of encounter. wrong.
when i did that, the other 2 STILL took the damage and their gear broke, and my gear broke.
has anyone seen/gotten this? or even know what the fuck it is?