What happened
The incident occurred during the ground roll immediately following touchdown. As the airplane was decelerating on the runway, it began to swerve toward the right side of the pavement. In an effort to correct the deviation and maintain directional control, the pilot applied pressure to the left rudder pedal.
During this corrective maneuver, a mechanical failure of foot placement occurred. The pilot's left foot slipped off the top of the rudder pedal and became trapped underneath it. While the pilot was attempting to reposition his foot onto the pedal to regain control, the aircraft continued its trajectory to the right.
Unable to stop the momentum, the airplane departed the paved surface of the runway. It traveled across the grassy area adjacent to the pavement and impacted a berm located on the right side of the runway environment.