When the sniper’s bullet shattered Paola Bautista’s arm, her sister and a stranger in the crowd at the Route 91 Harvest Festival got her to cover. Then they focused on the bleeding.

Daisy Bautista stuffed a sock into the hole in her sister’s arm, and the man who was helping them pulled a belt tight above the wound. That improvisation may have saved Paola’s life, preventing the kind of massive blood loss that is the single greatest cause of trauma death.

Bautista, a country music lover from California, is one of several Las Vegas shooting victims who benefited from the use of a controversial and centuries-old life-saving tool that is making a comeback - the tourniquet.

Paola Bautista, 39, from Fontana, California, sits in her hospital bed at Sunrise Hospital & Medical Center after being shot at the Route 91 music festival mass shooting next to the Mandalay Bay Resort and Casino in Las Vegas, Nevada, U.S. October 4, 2017. Picture taken October 4, 2017. REUTERS/Lucy Nicholson