As I am bored with this just dug out the flight manual for a 500D
This is the quote ref to height vel diagram
" Airspeed/alt combinatins to be avoided in the event of an engine failure during take-off are shown in the height velocity diagram"
Basically there is no diagram for landing, if there were the curves would be much smaller as you are not climbing, you have more forward energy and the pitch angle of the blades is very low therefore much easier and quicker to get into auto.
As a flight examiner I would be seriously worried ( consider failing on safety grounds) if a ppl was trying to land a heli from 100 ft at 65 kts espically in minimal wind.