LB
It appears that the most likely explanation is a lack of visual awareness and loss of comms to instruct where to go. I've never flown a helo, but read another helo guy talk about the 11 min of turning in circles as a possible cause for pilot vertigo, combined with a lack of visual awareness, as a possible answer to the crash. How does that line up with the flight radar showing the dip in altitude, then what appears to be a struggle to go up very fast? Would that be a possible explanation?
Also, NSTB said today that the rotor was on another side of the hill. Fuselage in one area, and tail section 100 yards away IIRC. So it was hard to discern whether this was a result of one part (possibly the tail section or fuselage) hitting the hill, then dispersing in different directions, or if there was a sudden loss of the rotors.