Not to speculate, but stuck object under collective could be the reason why a highly experienced pilot didnīt make it in the auto. Especially if it only takes 2 sec from norm rpm to stalled condition like some of you stated in your calculation.
Tech info;
The ELT I belive has a 10 G switch, ref early post stating it was sending.
Low on fuel puts this ac around 2.3t in pd config.
The ldg gear is constructed to absorb vs of 600ī ft/m.
Knowing this, zero fwd speed and roof absorbing some of the energy we would assume the blades stalled out at considerable height.
Q; from earlier picture, it shows dual controls. Is this correct?