The scenario for the pilot to exit the helicopter with rotors turning must be carefully thought about. Here are some of my choices:-
1. Passengers have departed and have left a door open. Flat ground. Little or no wind, no gusts of wind. No chance of other persons entering under the disc.
That's all folks
As most modern engines have a run-down time of 2 minutes or less, any other scenario, especially with untrained/unbriefed persons nearby I would close down, sort the problem and restart. Remembering to ensure that the TOT/T4/ITT temp is below starting minima, usually 150 degrees Centigrade before engine relight.
The time this would take would be less than 5 minutes and there would be that nice confortable feeling that all is safe and done properly.
If a situation of saving life were to require instant disembarcation then so be it BUT at no risk to others.