What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Aircraft initially was on approach to runway 31L at kbfi, then ATC directed the pilot to land on runway 31R. Aircraft briefly touched down on 31R with the gear in the up position which causing damage to the propeller, at first the pilot attempted to go around but was forced instead to land the aircraft further down the runway. According to ATC tapes the controller attempted several times to notify the pilot that the gear were retracted and to go around. However it is unclear as to what point in the landing sequence the ATC made the attempts.
As the FAA filed it
(-23) AIRCRAFT INITIALLY WAS ON APPROACH TO RUNWAY 31L AT KBFI, THEN ATC DIRECTED THE PILOT TO LAND ON RUNWAY 31R. AIRCRAFT BRIEFLY TOUCHED DOWN ON 31R WITH THE GEAR IN THE UP POSITION WHICH CAUSING DAMAGE TO THE PROPELLER, AT FIRST THE PILOT ATTEMPTED TO GO AROUND BUT WAS FORCED INSTEAD TO LAND THE AIRCRAFT FURTHER DOWN THE RUNWAY. ACCORDING TO ATC TAPES THE CONTROLLER ATTEMPTED SEVERAL TIMES TO NOTIFY THE PILOT THAT THE GEAR WERE RETRACTED AND TO GO AROUND. HOWEVER IT IS UNCLEAR AS TO WHAT POINT IN THE LANDING SEQUENCE THE ATC MADE THE ATTEMPTS.