Side note just to clear it up regarding leaving with the pax bag still in the hold (in Aus at least). If the pax voluntarily leaves a flight or no shows their bag must be removed as it could have been checked in for sinister purposes.
However, If the passenger is involuntarily removed (and therefore had no way of knowing they would be removed and would have travelled on the aircraft with the bag in hold) The bag can actually fly, as they had no way of knowing that they would not be on the flight. This is going back to DJ policy a few years ago, but I'm not aware of it being changed.