Flame Patrol Warrior Bruener:
I don't think this is always the case but... Nerva's Temporary Prison is a bit strange right now. Detainees get violent after a while. Maybe there's some kind of aura there or something. Well, if you want, you can just open the door for him and come back. Our goal is to cut off the source of money for the Nerva Orc military, not lose fine friends like you!
The Nerva Orcs should have a Nerva's Temporary Prison Key. Kill them to get it.
No one knows how Treasure Dealer Kaysen will be when you get inside the prison. So, use your sense. You know the old saying... 'Timing is key!'