The only time I actually failed that was because my vision was a bit more poor than I thought for the poison room. I did not see that opening that takes you to the exit and endlessly looped around the room looking for the right path to the exit. Second run through I felt around and found it.

Either one of the npcs was spotted by the statues on the last one I ran it through with, which was odd because I was fully hidden from both statues i.e. hiding in the nook. It was interesting because the messages they give you when the debuff stacks made me think of my WoL thinking suicidal thoughts. When I realized that, I thought damn, that's dark.