Facts And Speculation
FACTS:
Several eyewitnesses, including pax on the a/c, report a pitch-up followed by a sharp pitch down.
Surprising short tracks on the ground (approximately one a/c-length), indicating low forward velocity.
3 deceased FCMs remain in the cockpit on the authority of the Dutch Public Prosecutor.
SPECULATION (for the PPL'ers):
An eyewitness who was one of the first to assist survivors noticed oxygen masks were deployed in the cabin? Maybe rapid decompression at 200'?
Maybe some of the spark plugs were dirty and not all cylinders were firing, just I once had on my 172?
As there was a check captain on board and cloud base at 800', maybe they were practicing a precautionary with low level circuit and short and soft field landing? I had to do that once too...