The prompt, decisive and effective action of the Tuscon woman in depriving the shooter of his loaded ammo clip is most commendable. However, according to reports I’ve heard the shooter was at that time being held down and restrained by two other erstwhile bystanders, and therefore not very effectively capable of physically opposing her grab for the clip.
“heard the shooter was at that time being held down and restrained by two other erstwhile bystanders”
Yep, shooting the perp in the head under these conditions would be considered unsporting and legally questionable.