I don't know what happened. Apparently there are witness reports about engine roughness and others talk about a spiraling downward motion. Anyway, if I ever have
an engine failure, I hope I have a similar field below me...
Edit: This newspaper mentions stall practice, but their source is unknown to me...
Hasselt - 'Vliegtuigcrash in Borgworm mogelijk te wijten aan stuurfout bij standaardoefening' - Hbvl.be