What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Airman dambkowski was instructing in the Mooney. During a landing, dambkowski inadvertently gave the command "gear up" to airman dalzell. Before dambkowski could react, dalzell had moved the landing gear handle to the up position causing the landing gear to retract while the aircraft was on the runway. The aircraft subsequently slid approximately 400 to 500 feet down the runway on its belly.
As the FAA filed it
(-23) AIRMAN DAMBKOWSKI WAS INSTRUCTING IN THE MOONEY. DURING A LANDING, DAMBKOWSKI INADVERTENTLY GAVE THE COMMAND "GEAR UP" TO AIRMAN DALZELL. BEFORE DAMBKOWSKI COULD REACT, DALZELL HAD MOVED THE LANDING GEAR HANDLE TO THE UP POSITION CAUSING THE LANDING GEAR TO RETRACT WHILE THE AIRCRAFT WAS ON THE RUNWAY. THE AIRCRAFT SUBSEQUENTLY SLID APPROXIMATELY 400 TO 500 FEET DOWN THE RUNWAY ON ITS BELLY.