I know a guy that had a very similar incident in a Twin Squirrel, on landing the machine went berserk and started thrashing around. Fortunately it was on a large gravel parking lot and it slid around the show while he was chasing the throttles to close them off.
By the time he got them closed the machine had moved about 15 meters on the pad in eccentric circles.
It turned out the starflex had delaminated and threw the blades out of sync once he landed.
A LOT of bits had to be replaced on that ship.