I don't understand...
People are describing cyclic back as 'flare' as though it's an exponentially decaying manoeuvre.
I see it as 'gybe'. Sailors will recognise this as a quick change of sail direction across the wind. In this case it is a movement of the rotor disc leading edge from below to above the slipstream.
By suddenly raising the front edge of the rotor disc you get the slipstream flowing UP through the disc, a necessary stage in approaching autorotation if you were in powered forward flight.
henry_crun
dull old engineer