The story from malaysiakini is hardly surprising.
Gov't pathologist disputes Pornthip's findings.
Based on his so-called expert(?) testimony, he wants us to believe that both the head and anal injuries are caused by the fall.
This can happen if the body does a 180 degree somersault whereby the neck gets trapped in some narrow place; then releases itself and the body then continues to fall feet first and pierces some kind of pointed object that can penetrate the anus.
Now isn't that incredulous?
I don't believe that is possible unless the expert can show exactly what happened to cause the injuries and not simply claim that that was what occurred. Maybe a layman will describe it as such but for a professional, it hardly meets any decent standard of expertise.