If Trump was the target, I have no doubt his torso was the target. The problem with the AR-15 (which was a design feature in the M-16) is that the bullets tumble after firing, thereby having low penetration power but making a damn nasty would because even a hit on, say, an arm, which would be a through & through impact with a normal rifle, transfers all the kinetic energy of the round to the point of impact. This is why AR-15s are meant for close range with rapid fire — hits that would be wounds become fatal, and with multiple hits the word “hamburger” starts being used to describe the victim.

At 140m with an unskilled shooter? Major luck getting a piece of ear.

VERY lucky for the crowd that the SS snipers got the shooter before he squeezed the trigger too many times, because most of the rounds were destined to be collateral damage. The bystanders who were hit were critical or dead, because that’s what AR-15s are designed to do — accuracy, not so much.