Jeffrey Mains was in shock. During a vengeful rampage, a deranged former security guard had fired a hollow point bullet into Mains' truck. The bullet's path through steel slowed its velocity, causing it to tumble sideways when it collided with Mains, a phenomenon that ballistics experts call the "bullet's yaw." The bullet's impact and ensuing yaw were over in a blink, but the effects were profound. Mains' bowel was pierced and leaking, his liver...