Indeed-one of the problems of social media is its instant and often clipped causing equally instant reaction and over reaction.The actual ex copper on here suggests it will go through the complaints procedure and the head stomper might have a case to answer, but the people who want head stomping to become more mainstream seem to know better.
Until the context is known, no one knows how proportionate his response was.
It looks incredibly violent but contextually we do know 3 officers received treatment at hospital, one with a suspected broken nose and there existed a ‘clear risk of their firearms being taken’
This was clearly already a v violent incident. Every officer has to comply by law when using force: under s117 Police and Criminal Evidence Act, s3 criminal law act 1967, Article 2 ECHR and Common Law.
Without doubt this will be a referral to the Independent Office for Police Conduct.
There will also be a criminal investigation into the 4 persons arrested which will likely mean most footage, certainly from Body Worn Cameras, will be sub judice-ie subject to justice and therefore not be released publicly.