Dude, that's just crazy! How can you even say a word in defence of that copper?!No it wasn't justified, If I however may play the devils advocate. I have been in a situation similar, albeit more intense than this situation as a boarding team member while in the military. When your adrenaline is running and you are on edge, a split second decision is tough to make especially when it is reactionary and not voluntary so to speak. However the officer made a bad call, and his trial is to determine responsibility for the trauma caused to the rider, which he will be found guilty of.
Its easy to say what he did wrong after watching the video and seeing all the facts, and Im not sticking up for the officer by any means, but just imagine for one second that you are in his shoes at that moment in time, puts it in another perspective, and you can see how a situation can escalate exponentially.