Background
The pilot was flying with a passenger at the aircraft owner's request to help the passenger become current, as the passenger had not flown any type of aircraft in the preceding eight years.
Flight
The pilot was performing a no-flap three-point full stall landing. The passenger was following on the controls with the pilot.
Accident Sequence
During the landing roll, as the airplane slowed down, the pilot released some pressure from the rudder pedals to slide his toes up onto the brakes. As soon as pressure was released, the airplane began to swerve "one way then the other." The pilot attempted to correct, but the airplane "spun a 180-degree turn to the left." During the turn, the left wing tip and the right elevator struck the ground.
Pilot Report
The pilot reported that the passenger was wearing heavy boots and may have inadvertently "kicked hard right or left rudder and then became briefly entangled in the rudder pedals."