What I find interesting is the rotor disc doesn't tilt. Even as the aircraft lifts tail first. You'd think they would have at least shifted the cyclic aft when the tail came up. But I don't think their intention was to fly. The aircraft starts to slide forward on the skids then the tail lifts rather uncoordinated and it flops over. My SWAG at the moment is either an unintentional control movement in the cockpit or a disconnected control tube at some point like at the mixing bellcrank or on the deck where the cockpit crew was simply along for the ride.