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got my best time, a little over 1:30 using this advice and solo, ironically. it also helps to not push too fast in the first room, attempting to keep the bad guys between you and the second door.

*blank stare leads into heavy sigh followed by crushing facepalm *

a little extrapolation..

All mobs in first zone must die. Does it pay to use abilities that "push" the fight towards the second door, or would that involve skills that tend to scatter mobs too...

how did I know this post would be worthless...

I'm stuck around 1;30 as well.. can't say I remember doing anything extraordinary to get that. stands to reason other factors like group...