Interesting
I don't remember values that high but good information.
It doesn't appear the helicopter fell from the sky as one witness indicated, due to the impact attitude being flat - implies some pilot awareness and controllability post the low pitch attitude picture.
I remember on engine failure the AS350 rotor decays rapidly, like other low inertia rotors; lot like the H300C.
I can imagine a pilot getting startled by the hugely loud low rotor horn (that's what I remember from the D-model), being delayed in collective reduction, and getting behind the recovery curve.
He may have just had too much ROD to effect a recovery at the bottom.
Very sad stuff.
WIII