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It sounded like engine failure to me, however if that was it, the
pilot should have been able to manage it better than that. Does that
heli have hydraulic controls? What happens to the hydraulic controls
if the engine fails? On a car, you still have steering, however, its
a lot harder to work whe the engine quits turning the hydraulic pump.
Is it the same way on a heli? If it is, then maybe the loss of
control was the pilot trying to force the controls.

The 206 has hydraulic controls. The pump is driven by the transmission, so
if the rotor is turning then the controls are powered. If the hydraulics
fail, the aircraft is still flyable with a little difficulty; the pilot will
have increased control loads.

Also, early versions controlled the tail pitch hydraulically, most have all
mechanical tail rotor pitch control.