I get where you’re coming from @Sharpshooter, but I still say there is no way to know all the answers you need to know until way after the fact. A knife vs a gun has been proven out to be a dangerous situation more than once. She could have waited until he was 3 steps closer, but she could have missed those shots. What if he increased his speed? What if...well, what if we “what if” this to death. Armed, instructed to drop it, still advancing. Had that been a rifle shot from 100 yards away I might be a little more on the same page with you. Justified shoot.
That Wendy’s shiit that went down....that was a bad one. There are plenty of bad shoots out there....this wasn’t one of them.