TT,
In the old days VR was near impossible to recover from - witness all the pictures of crashed Sycamores shown to us at the School. Modern design means that forward disc is more achievable - "blows", if you like, the vortices off the disc hence lessens ingestion - restores angle of attack, lower lever reduces angle of attack inboard to below stalling angle - requires lots of alt agl. Still wouldn't push a modern helo into fully developed VR.
GAGS
E86