Add preclusion too, for non-LEOs.J.A.M Factor
Jeopardy. Ability. Means.
This is what I was taught. You have to process all three of these before you shoot someone. Is your life in Jeopardy? Does this person have the ability to kill you? Does this person have the means to commit the act?
In this case the victims life was in jeopardy, the criminal was not disabled or in a wheelchair (ability) and he had a knife (means).
Shoot the M effer.