Not sure if the other posters have quite explained what you were after so I will attempt a different perspective:
In low g, there is no loading on the main rotor disc.
Because the thrust vector of the tail rotor , as viewed in the fore-aft plane, is higher than the lateral center of resistance to sideways movement, the airframe will want to roll over.
If the roll is not corrected, a dangerous attitude will ensue.
Because there is no loading in the main rotor disc, applying cyclic against this roll will not have any correcting effect.
In a teetering two bladed rotor, applying more cyclic is not only futile, it will lead to mast bumping and possible separation of the rotor head from the mast.
So the correction is to add load to the main rotor disc by one or both of aft cyclic and raised collective.
Ok, shoot me now.