FRiend, the only thing I remember from the crash is that my pilot did the right thing and that he was cool and saved my and his life ( and a Vietnamese interpreter) , if I hadn’t lived I wouldn’t have 2 great adult kids right now :-)
Always a good thing...Any landing you can walk away from is a good one.
However it happened the witnesses saw the aircraft spinning left which does indicate a loss of tail rotor effectiveness. The blades on the AS-350 go the wrong way.
An additional challenge for the pilot would be the height of the helipad on the building. As soon as you move away from that pad, you are in helicopter no-man's land. Too high for a hovering autorotation, too low for a zero airspeed auto, too slow for a regular auto, too slow for the tail fin to counter the main rotor torque. Every time that pad is used the aircraft has to fly through that regime, both landing and taking off.