Points for Discussion;
You're in the hover filming over a built up area (such as Edinburgh) and have an area of parkland in mind as your area to alight in the event of an engine failure;
I recall R44 Handbook states in Autorotation ~ 0.7nm Glide distance per 1000ft?
1) Your engine stops and you place your normally noisy helicopter into Autorotation to the spot you have selected - there maybe people walking dogs etc - has the situation been worsened by the reduction in aircraft noise to alert them you 'dropping' their way or would they all hear the donkey stop, look up, and clear the area for you? How about the blind person walking his dog or the chap with his Ipod on full blast?
2) You follow the above with a successful EOL and everyone is unharmed. Have you endangered life / property on the basis that if it had gone wrong an impact may send debris flying about the place or result in latter stages being uncontrollable - where might the aircraft end up? Or is it job well done, pilot saves the day?
The recent Bettystown incident (although different circumstances) highlights a number of issues regarding landing site selection and congested areas.