Dick Smith as you can see on the screenshot above they were not circling, but rather turning towards Williamtown before they descended in a sharp left turn. Assuming the Huey has a counterclockwise turning main rotor like all US products, loss of tail rotor / tail rotor effectiveness would have resulted in a clockwise turn, not counterclockwise. Loss of control due other reasons would appear more likely. Descent rates, two reported at 8000+ and 9000+ fpm is severe, far higher than autorotation. Something catastrophic must have occurred.