well, holding up your hand, all fingers extended and apart and whole hand being pushed away from the body is universally accepted sign language for stop. if you were in his position, scared of somebody walking up to you, or in this case driving, and blowing themselves up to kill you, you might be a little more apt to shoot somebody before they kill you. its called survival instinct. i dont blame any soldiers for shooting abnormally acting civilians. i dont condone it, but i cant blame them at the same time when theyre scared some random person might walk up at any minute w/ explosives strapped to their bodies and detonate themselves. put yourself in their shoes for a change.