My guess. A training flight with a cadet on board. That's a 15kt crosswind landing, so my guess is cadet didn't follow through with enough rudder post rollout, applied late or worse pressed the wrong pedal. This same attitude you hear on the frequency is what resulted in a SmartWings 737 flying single engine for almost 90 minutes over Europe. Men of steel out there. Nothing can be done to break their steely resolve.