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Fair point. They could step back until he has access to someone to stab. That makes complete sense. At what point do you draw a line in the sand before you do something? When he murders someone? The guy in America who murdered school children with a rifle last week was shot dead. Should he have been reasoned with? Whilst the reasoning goes on, the chances of more fatalities is there. And I know I am raising the bar there but at some stage you need to draw a line in the sand. Totally appropriate, lawful, proportionate and subject to scrutiny. Decisions have to be made to protect people and, believe it or not, police officers are people too.
It doesn't look likely that he can trivially stab anyone, the officers appear to have room to step backwards.
https://twitter.com/CrimeLdn/status/1533136866035347457