Perhaps they were about to play the same trick they allegedly played on a mate of mine who was a loadie with the TA. Open hatch then run at ramp to prove the restraining straps work to stop you from going overboard when load dropping. Only since they demonstrated it on the ground they moved the karabiner securing the strap rearwards to the next anchor point.
I met a Scottish bloke at RAAF Amberley who did a bit of 'ramp surfing' in Africa. He was attached by his harness to a restraint point, but when he got back in the aircraft and attempted to change restraint points the ring lifted out of the floor
You can be a T/A loadie over there?