The video is fascinating - just over 7 minutes - and if you listen closely you can hear security forces calling on Mujali to come out, although I didn't hear them calling on Qasim al-Raymi to exit the building. Of course, he escaped so maybe he was already gone.
It was also impossible for me to tell whether the mafraj had some qat skeletons on the floor. (Does AQ chew qat?) I do know that I wouldn't do any "ghost-busting" in that mafraj.