In an autorotation, the airflow from below, keeps the blades turning (PROVIDED you "dump" collective pitch immediately) thus building up enough rotor system energy for a "flare" and to apply pitch before touchdown when the rotor rpm then decays as you touch down. And it is a repeatable, practiseable (!) and survivable manoeuvre, almost anywhere.
Tail rotor drive failure is altogether another (lethal) animal though it is POSSIBLE to mitigate the forced-landing by autorotating if immediate and correct action is taken.
Hope this helps..........
BTW, not current though have a fair few heli hours........
