A biker fresh out of prison planted his boots in front of my idling SUV at a red light—and saved my son without laying a finger on the door. That’s the moment the traffic stopped. That’s the moment I ran out of excuses. It was forty degrees with a film of fog on the glass. My boy, Eli, fifteen, lifted his palm and drew a small shape into the haze. A circle. Four points. A needle. A compass. He pressed his hand harder as if he could push his message straight through the window and into the street