I wonder who removed the chocks, as they should be the last thing to be removed prior to taxy after all equipment is clear followed by hand siganals.
Or was it a case of the aircraft jumping the chock/s?
I always used to put the GPU infront of the nose, never to one side of the aircraft, 2 reasons for this;
1. in case the aircraft jumped the chocks, it was between you & the aircraft.
2. The crew could see it especially,with the Obstruction light on the top, having said this we shall have to wait the outcome of the investigation.
Pleased to see that no one was hurt.