this is the ONLY control movement that will lead to stopping and reversing the falling rotor rpm
Pete,
With respect, that's not considered to be correct in UK (mil) teaching - which I believe still includes a demonstration of Nr decay caused by rolling the (only) throttle to idle in the cruise, and doing nothing with the controls. The recovery from the ensuing rapid Nr decay was always to lower the lever to prevent further decay, then flare to restore the Nr. Perhaps someone currently active at Shawbury can confirm?
TOTD