If a trauma kit is available and the injury is on a limb, pull a tourniquet tight around the person's arm or leg above the wound. Contrary to some popular ideas, Kerby says, a tourniquet doesn't mean that a person is going to need an amputation—if a tourniquet is on for under two hours, the limb will probably be fine. "We have to break down those myths," he says. "You're not hurting the patient, you're saving their life. Life over limb."