tescoapp,
Had exactly what you describe happen to me once while teaching a spin; you couldnt tell that the engine had stopped (apart from the low volts light that always came on at low RPM) until the prop stopped........
As for stalling the prop - I guess DB6 is strictly speaking correct.
Next question : If a windmilling prop stops; how fast do you need to go to get it windmilling again ????
Answers on a postcard....