“the helicopter was in a left bank with a descent rate of over 2000 feet per minute prior to impact?”
My first question is, how did the NTSB determine the descent rate or the left bank? There was no on-board equipment nor ground-radar contact.
It sounds like he flew into a hillside that sloped away at an angle at about 2,000 ft/min, which is about 22 mph. Sounds about the right speed if the pilot was trying to find the entrance to the canyon.
I agree with Larry S., get out of trouble first, then deal with the legal stuff. Alive.