AnFI - I fly an Airbus helicopter and the yaw system has a position transducer and a yaw force link - both of which are there to coordinate the AP computer's output and are exactly NOTHING to do with Nr.
Do please explain why you would command an Nr change with a yaw sensor instead of a collective one.
I think LAla's point was that you were explaining basic governing as if you were addressing a 5 year old and not a helicopter pilot - then you make a statement about not moving the lever and the power decreasing without any qualifying comments about having increased speed.