Yeah exactly! The tower is very heist-y. Would have been neat if bringing the harpers the info allowed Belth to get the artefact, then you have to grab it from the tower and escape before the Harper assault.
I say that like I'm even out of the Shadowfell. Still have to cheese Big Belth before continuing.
I also avoided killing him thinking that an all-seeing Absolute would catch on to my "betrayal". I wonder if an evil playthrough has the same issues in Act 2 or if it's different enough to not fall ill to them.