If you look at the photo the aircraft was being tracked and balanced for the main rotor. You can see the orange tape down the side of the main rotor mast pylon. this tape holds the magnetic pickup wiring down the pylon and eventually into the cabin for track and balance. Not sure if that had anything to do with the accident as it seems from the picture that both main rotor blades are still attached.
On a personal note I worked with the deceased pilot/owner about 7+ years ago. He flew for the company I work for and was a damn good pilot and person. RIP Mark.