Action always beats reaction.
I'm the last guy on this site to defend a cop, especially a union one,
but the rule I was taught is 7 meters. Any threat inside that bubble is
deadly force, if indicated. That works both ways. By their job
requirements Cops have to invade that range. So I understand why
the least little action on a subjects part will possibly result in a death.
I fear and do not trust our police. They are licensed killers. That is
the society Hawaii has chosen. Don't do stupid or they will kill you and
have a beer afterwards. OBEY!