Weird Death in Torghast

ilv 410 fury warrior solo Torghast for transmog run in Skoldus Hall, layer 14th.
There are some mechanism will have percentage damage on HP.
But at level 70 all mobs are just no threat.

Then suddenly I was killed by oppressive aura and anima missile.
After I check my Detail!
It shows like this:
-10.0s -444.5K (100%) [Anima Missile]
-10.0s (100%) x1[Oppressive Aura]

I don’t recall any torment or mechanism can cause this issue.
Any idea?