Happened to me on May 3rd 2015, so I guess this bug is still around.
For what it’s worth, I didn’t notice Efut was important at first and ran right up the path toward the keep. Didn’t even see the bone wall appear, didn’t realize there was anything else going on until the dialogue started. Then I continued toward the wall until I realized I was supposed to be with Efut, doubled back, and Efut was stuck. Tried finishing the mission on my own, got stuck at the very end, had to restart.
Staying right on top of Efut from the moment she appears got me through it seems. So I dunno.