perhaps some Accelerate Stop calculations for NE might be a good idea.
He was landing, wasn't he? In which case, accelerate-stop caclulations mean precisely squat. Maybe what you really mean is a calculation of landing distance required, and a factor for brake failure/spoiler failure/flap failure etc.
On a short strip like Dairy Flat, you really have to wonder why he didn't open the tap and go around - he must have hit the brakes almost immediately after landing so would have been aware of the failure whilst still having lots of speed for the go-around.
But then... inexperience... PPL... more money than sense... etc