No idea why this happened to you.
A few days ago i joined ee citw, i decided to go in and clear the start before anyone else.
I stood there fighting 2 red names, 2 orange name and some trash for like 4 mins - on my much much less prr/mrr, no ac, 20 dodge, not optimal geared rogue. (lvl 30 thou').
The lowest hp i got - i think the peak was around 50% hp between cd.
No idea how you managed to die on a lvl 20 ee quest.
If you play on Cannith I can join ya and see whats actually going on and what you're doing wrong (if u still here ofc).