About the tail rotor?
I ask this question because I want to know.
What damage could be caused by using left pedal to slow the rotor system? It's applying the same load to the transmission and bearings as it does in normal flight (unless there is something detrimental about having the MR ring driving the TR driveshaft).
I see that once the MR and TR have slowed to about 50% RPM, you want to reduce pitch on the TR to reduce flapping.
What am I missing?