Be interesting to see the results of that part of the investigation, Because if bloggs is right and the boom simply failed, you'd be a very worried AS350 driver if that was the case.
On the contrary, I wouldn't be the slightest bit worried. With a main rotor impact like that, the tailboom separating under the result of a sudden stoppage is the last thing you would be thinking about.
I'm more concerned about the front seat turning itself into the backseat.