Hi Mike...
I 'm puzzled over the fact that the torque of the rotor didn't cause the fuselage to rotate like a helicopter would without the tail rotor.
Do you suppose that the prerotation is turned off at the point of jump off? If so then the rotating inertia of the rotor must be sufficient to carry the plane to the remarkable height that the video shows. Or, maybe there was sufficient wind blowing to make the plane appear to hover stationery????

BillF