Exactly Step. Deliberately spinning at low-level is like practicing bleeding.
Its breathtakingly stupid.
In the glider example cited I don't understand the relevance of the two Tornadoes either. If the instructor's intention was to lose height quickly, a spin is not the correct manuver.
I call bulldust. I was tempted to ask "what sort of glider" but then realized its a moot point, bulldust is bulldust.