In the reddit video, there is a massive yaw to the left to almost 90 degrees followed by a slight swing back to course then tailboom appears to break under aerodynamic forces as the aircraft descends, following by separation of rotors and gearbox together. Could a gearbox failure stop the tailrotor causing a massive uncontrollable yaw to the left? (any B206 pilots can confirm this?)
RIP to all involved, a horrific and tragic accident.