In the wake of the deadly Oct. 1 shooting at the Route 91 Harvest music festival in Las Vegas, stories of individual sacrifice and bravery emerged everywhere: Strangers risked life and limb to aid the wounded; commandeered vehicles to rush them to the hospital; provided life-saving first aid; and, in some cases, shielded others from fire. One such story wasn’t a story at all, just a moving photograph: a man on the ground protecting a woman’s body with his own as the shooting continued around them.