#85 - March 25, 2016, 11:44 p.m.
Ah, this thread. Okay so aside from this being a really old necro-post, I'm actually curious if anybody has exact steps to reproduce this, because we're not actually sure why we're still seeing reports.
We actually fixed the primary way this event could break back in 2014 (Warlords 6.0 patch) by changing the action sets for Weegli Blastfuse and the other NPCs. Previously, once you defeated Nekrum & Sezz'ziz you only had a few minutes to chat with either Sergeant Bly or Weegli before they'd hearth out. Now, they'll sit around forever and wait for you to initiate the conversation with them. Once you talk to Bly and start combat with them, Weegli will run to the door and blow it up. Alternatively, you can talk to Weegli directly and he'll open the door with you.
I suppose it's possible that Weegli is dying in combat when the trolls swarm the stairs? That seems unlikely as the NPCs are pretty good about taking damage, but that's the only thing I can think of.
If you folks are able to help us out and provide precise steps to reproduce, it would be appreciated.