(edited by Mooncaller.9634)
AC Two Man, Detha Glitch
I am not sure by your explanation but if this is the bug where Deta would stand in the room and not start the next part of the dungeon, you can try to fix it by getting her killed and resurect her.
Though this bug is a bit annoying
We looked up that bug, and tried multiple times. Got her killed and revived her a few times, walked her back. Unfortunately, she did not unglitch. And considering the hour, we gave up.
We shall have to do it again.
Also, not as impressive as a solo, but still fun to do with a friend. A good challenge.