When defense is the the highly subjective, "I felt threatened," there are few ways to gainsay it.
No, there is no magic words did someone can say that justifies the shooting, cop or not. Simply uttering the words “I felt threatened” gives you no magic legal protection. It always comes down to what a reasonable person would accept. For that threat they say required deadly force, despite all the drama on the thread, it pretty much has to be something that the reasonable man, legally speaking, would agree with.