‘He was lying face down on the floor. The officers had every opportunity to handcuff him. He was not posing any threat at that point.’
I doubt that any armed officer would put thier semi-automatic weapon down in a highly volatile environment to put some handcuffs on an aggressive protagonist who is resisting arrest.
Given that several fellow officers have been assaulted, including said officer, & bystanders are hostile. I understand that one of the protagonists had tried to get a weapon off an armed officer.
There were no opportunities for any of the officers to routinely handcuff the protagonist. Multiple efforts to contain the situation had been made.