First thing that came to my mind when watching the video was this incident from 2003…
https://asn.flightsafety.org/wikibase/188940
RiP Ian (Shoo), Neville and James.
Eyewitnesses heard unusual noises coming from the helicopter before the tail boom apparently folded forward around the cabin. The helicopter then fell to the ground, catching fire on impact. All three occupants received fatal injuries.
Examination showed that the two gearboxes and the main rotor had detached before impact.