Had a friend on the flight and they were stuck on the aircraft in Adelaide for a couple of hours after a very rapid descent due to a medical emergency. Had some trouble finding someone qualified enough to move the plane back on to the runway!?!?. The passengers (not including the ill one I assume) weren't allowed off by management as "they inevitably get lost". If they had all deplaned due to a medical emergency then it would have been [to a] terminal. Fortunately, it being Adelaide they could have gone to Paradise!