His assailant was clearly armed, so the officer was definitely authorized to use lethal force. If you watch carefully, you can see that the officer wasn't aiming center mass when he discharged his pistol, so I think we should all applaud his restraint.
I was watching my little bro at Special Olympics Golf last year, and everyone's teamed with a partner without a developmental disability, one of which was an off-duty cop, who loved nothing more than to take out his gun and show it off, twirl it around Robocop style and put it back in his holster, on the golf course, like some parlor trick. It looks like our friend here was doing something similar to impress his wife when the inevitable happened. I really hope that cop's not back this year.
I don't see whats odd. She wasn't thinking about the value of donuts, she was just thinking to grab everything and remove it from the elevator before the elevator could wander off.
What I noticed is that she picked up the shell casing, which is either quick thinking (better grab this evidence before it disappears) or not thinking at all (BETTER GRAB EVERYTHING).
I'd have stuck the purse in the elevator door to keep it there. Well actually I'd have screamed and stood there running in place for a minute, but now that I am prepared I will scream then jam the door if someone shoots themselves in my elevator.