Quite right TOURIST
You wouldn't even need to do as much as 30degrees and 30kts, before you re-applied power and climbed away.
and you are right you can make vortex ring from autorotation, but it's a fairly extreme scenario. If you auto vertically at zero airspeed (ie zero wind day and vertical) and you just pull hard at the bottom there is a strong chance of just 'falling through' as you make a vortex rather than significantly arrest your descent. If you are just off zero speed at say 10kts airspeed its still a pretty hairy arrival anyway, but worth staying composed, unlikely to kill you if you stay flat. Depends on the helicopter. (rotor energy / power required gives useful 'hover time')