""The chief operations officer of the Vaughns took a gun from his desk and dispatched the Muslim jihadist. That is why we have guns. If the Brits do not like they can all (fill in blank yourselves).""

I'm sure the victim's family will be MOST impressed that some gung ho, trigger man shot the perp, who didn't know about not bringing a knife to a gun fight.

Over here that would be called "excessive force", unless he fired in time to save that poor woman.

Us Brits have people whose job it is to bring murderers to justice, not summarily execute them.