I was a good friend of the pilot's father who sadly died in this accident, and also know the pilot.
I spoke to the pilot at his father's funeral and can verify all of the above - it's very tragic that the father lost his life in an eminently survivable accident.
The emergency seems to have been handled perfectly, but from the pilot's comments, when autorotating an R-44 you have to 'run on' when landing, you can't bring it to a halt before touchdown - hence the almost inevitable roll-over on a very rough field.
All the best to the pilot - I hope he recovers in due course. His father really was a swell guy. RIP Pete.