http://youtu.be/H8WONzx5XSk
If you just want the beating, skip forward to the 2:45.
As the video is shot from behind the protestors there’s little context to what’s going on around, but it appears the police just charge the protestors and assault the protestors with batons and shields with no provocation. The camera person certainly does nothing aggressive or threatening yet is smashed in the face with a shield and hit with a baton
The video was not taken by me, but was sent to me. It was shot on the 18 October, 2014 at 23:38 in Mong Kok