Jordan Brizzell, 24, took this footage on April 8.
It shows the view from his helmet as he rides the Flying Nun, a popular MTB track in the Port Hills, Christchurch.
When he pulls up behind another rider, the rider refuses to pull over and let him pass.
At the end of the video, the other rider appears to attack Brizzell.
Police have today arrested a 45-year-old Christchurch man in connection with the footage. He has been charged with assault and will appear in court next week.