Sorry , I don't believe the t/r does continue to spin and create thrust . Also it would actually be quite easy to put a t/r on a rig and blow wind over it etc to prove . Lets just accept you can fly without it !!
I am happy to demonstrate if someone has a 350 they want to risk .... I would want a runway to land on however !!
There are also incidents where people have flown after losing t/r drive .