Whatever fell from the plane (the third track) gives us a clue as to the direction of the velocity vector of the aircraft, at the moment the object separated from it. It looks like they were using rudder (the only control that would account for the curved tracks), however it appears that all that was happening was the aircraft rotating around it center of mass while the velocity vector of the aircraft remained aimed helplessly at the ravine.
It looks like there may be a slight bit of evidence of nose wheel contact. Look just left (and above) the two yellow jacketed fellows in the foreground, just inside the left main track. That is where I would expect the nose wheel to be, if it were making a track.
