Just to be clear, in this hypothetical, did the player ever come to a
stop? This sounds like someone trying to throw without coming to a
stop, but failing to do it before the third ground contact.
Taking the disc out of the equation, if I were to walk three steps and
then drag my foot for my fourth step, I don't think you'd say I ever
came to a stop, especially if I took a fifth step..
Also likely didn't come to a stop as quickly as possible in terms of
size of final step and existence of final step.