Am convinced Gianmarko and earlier poster making a simile with a "drifting" car whose front wheels are tracking normally while the rear wheels skid across are correct. The easiest way I can think of putting this across it is to place the tips of the first three fingers of your hand in a triangle shape on a flat surface, the tips being the gear. Make your forefinger the straight, nosewheel track, and your thumb and middle finger the MLG track, and move them forward following the plot of the skid marks from the photograph. It is easy to imagine a plane behaving this way.
Whether by momentum, or rudder, or differential engine power, they seemed to be swinging back to a bearing parallel to the runway but not making it before the gully appeared.
I just don't see how the gear doors could make any such tracks as they would break off and not make a consistent mark all the way down their track. Nor would their track be black.