Okay, my two cents.
Firstly, we have no idea what age the people on bikes are, so any ‘child abuse’ lines of argument are null and void, although even if they are minors, they appear highly likely to be above the age of criminal responsibility.
Secondly, there’s a lot of conjecture and assumptions being made. We don’t know what has happened leading up to or following this event.
Thirdly, an awful lot of fuss is being made about reasonable and appropriate force; this is very much dependant on the situation and certainly NOT for anyone here to decide. However if the force used stopped the individual from making an escape, allowed him to be neutralised as a threat towards the police and public and yet he was still able to get up unaided straight afterwards, it certainly seems fairly reasonable and appropriate to me, (and I suspect quite a few others).
Fourthly, arrested?? Seriously? Cells full, paperwork backing up, resources required to obtain a conviction… We expect our police officers to exercise judgment of this type every Friday and Saturday night, let alone at times of mass civil unrest, looting, rioting, naughtiness, whatever you want to call it. We don’t actually know whether Nyone was detained for sure, but I personally trust the officer’s intelligence led judgement as to whether it is necessary.
Good luck to my colleagues in all of the emergency services in dealing with these extremely difficult circumstances. Stay safe.