Got to feel for the poor blinking pilot. He'd be so used to the cable laying down under him, rather than being attached to the top of the tower and following him down in a loop.
The rotor attach points are so strong (as you'd hope) that it's not just a matter of shearing off a rotor and dropping. It's a matter of all that kinetic energy being transferred to the fuselage with violent consequences.
That event makes it a very expensive Christmas tree!