I think another way to say what Nick stated is so;
,
Imagine the aircraft at a five foot hover with a stuck left pedal.
While maintaining that height above the ground the mainrotor is developing a value of torque. Call it 30.
If you lower the rotor rpm (say 5 percent) and want to maintain that five feet you must increase the collective.
So you've increased the pitch in the main rotor blades (brought the torque value back to 30)and left the tailrotor blade pitch at it's smaller setting and happily, travelling slower.
The lift equation has as it's largest factor airspeed. In fact it's airspeed squared.
Same output from mainrotor,
Less output from tailrotor.
