All buddy had to do was comply and get off the ice instead of being the escalator. They apparently gave him multiple chances and he took exactly zero of those opportunities. This is no different than busting up a house party, send everyone home except those who reside there. As it's a public park/outdoor rink, everyone gets sent home. It's not hard to follow.
Why does EVERYBODY get sent home? There is no regulation stating that implicitly. just saying. The restriction on outdoor activity is restricting public outdoor "gathering" It is not defined in any numbers, it is not defined beyond a concept of not gathering in a public place. So that the constables could say, who gathered here, and ask those to leave. At the point of screaming, tazer, arrest, nobody was still "gathered" on the rink. There was one person on the rink.
Where we are disagreeing on this is its presumed that individuals respond reasonable to sudden use of escalation and undue force. When you take a conflict resolution de-escalation course its the first thing that gets dispelled. You learn more about how alarm reactions are cited in the individual and how even normal individuals can become confused, disoriented, resistant, when what is happening is not making any sense to them and that they detect they are in danger.
Escalation results in confusion, resistance, build up, situations getting worse, and alarm reactions being button pushed. its why you don't do it.
Its why de-escalation workshops occur, and are mandated training in the first place.