I failed the quest once, and even though I felt like garbage, I tried again a bit later.
The key (from my understanding,) is to make sure you are close enough for the boss mob to kill you, preferably before he resets after killing your escort.
I had to wait about 1-2 mins for Tyrion, but holy crap was I relieved when he came.
Oh also, don’t release until it completes…but that may be a no-brainer.
So, key points:
- Make sure you die to boss.
- Do not release.
- Be patient.
- Run back soon as it completes and turn in.
All that said, the quest should NOT be this difficult to do right…but #NoChanges is also an excuse for Blizzard to save on man-power to fix these things. Maybe…
Edit: the boss sees through the disguise, but I’m not 100% sure. Dying to the mobs before your escort dies might also not be good, but I can’t say for sure.