(CNN) Addison Short and a friend tried to run for safety when they heard the pop of gunfire during Jason Aldean's performance Sunday night. But Short's knee buckled. "I just got shot, I can't run," she cried out.

The shooter firing from the window of a room on the 32nd floor of the Mandalay Bay Resort and Casino on the Las Vegas Strip had shot her in the leg. It hurt. Blood gushed from the wound.

"You go, just go get somewhere safe," Short told her friend, who escaped the bullets raining down from a shooter authorities identified as Stephen Paddock , 64.

From her hospital bed on Monday, Short recalled how she was wounded in the deadliest mass shooting in modern US history -- and rescued. A good Samaritan wrapped her leg in a tourniquet and whisked her out of harm's way, she told CNN's Anderson Cooper on "AC 360."

Photos: Mass shooting at Las Vegas music festival Debris is scattered on the ground Monday, October 2, at the site of a country music festival held this past weekend in Las Vegas. Dozens of people were killed and hundreds were injured Sunday when a gunman opened fire on the crowd. Police said the gunman fired from the Mandalay Bay hotel, several hundred feet southwest of the concert grounds. It is the deadliest mass shooting in modern US history. Hide Caption 1 of 30 Photos: Mass shooting at Las Vegas music festival Broken windows of the Mandalay Bay are seen early in Las Vegas on Monday. Police said the gunman fired on the crowd from the 32nd floor of the hotel. Hide Caption 2 of 30 Photos: Mass shooting at Las Vegas music festival People cross a street near the Las Vegas Strip just after sunrise on Monday. Thousands were attending the music festival, Route 91 Harvest, when the shooting started. Hide Caption 3 of 30 Photos: Mass shooting at Las Vegas music festival People embrace outside the Thomas & Mack Center after the shooting. Hide Caption 4 of 30 Photos: Mass shooting at Las Vegas music festival Police arrive at the Sands Corporation plane hangar where some people ran to safety after the shooting. Hide Caption 5 of 30 Photos: Mass shooting at Las Vegas music festival A woman cries while hiding inside the Sands Corporation plane hangar. Hide Caption 6 of 30 Photos: Mass shooting at Las Vegas music festival Concertgoers dive over a fence to take cover from gunfire on Sunday night. Hide Caption 7 of 30 Photos: Mass shooting at Las Vegas music festival Police take position outside the Mandalay Bay. Hide Caption 8 of 30 Photos: Mass shooting at Las Vegas music festival A man lays on top of a woman as others flee the festival grounds. The woman reportedly got up from the scene. Hide Caption 9 of 30 Photos: Mass shooting at Las Vegas music festival Hide Caption 10 of 30 Photos: Mass shooting at Las Vegas music festival People are seen on the ground after the gunman opened fire. Hide Caption 11 of 30 Photos: Mass shooting at Las Vegas music festival People run from the festival grounds. Hide Caption 12 of 30 Photos: Mass shooting at Las Vegas music festival A woman is moved outside the Las Vegas Tropicana resort. Multiple victims were being transported to hospitals in the aftermath of the shooting. Hide Caption 13 of 30 Photos: Mass shooting at Las Vegas music festival People are searched by police at the Tropicana. Hide Caption 14 of 30 Photos: Mass shooting at Las Vegas music festival An ambulance leaves the intersection of Las Vegas Boulevard and Tropicana Avenue. Hide Caption 15 of 30 Photos: Mass shooting at Las Vegas music festival A man in a wheelchair is evacuated from the festival after gunfire was heard. Hide Caption 16 of 30 Photos: Mass shooting at Las Vegas music festival Victims of the shooting are tended to in the street. Hide Caption 17 of 30 Photos: Mass shooting at Las Vegas music festival Concertgoers help an injured person at the scene. Hide Caption 18 of 30 Photos: Mass shooting at Las Vegas music festival People gather around a victim outside the festival grounds. Hide Caption 19 of 30 Photos: Mass shooting at Las Vegas music festival A couple huddles after shots rang out at the festival. Hide Caption 20 of 30 Photos: Mass shooting at Las Vegas music festival An injured woman is helped at the Tropicana. Hide Caption 21 of 30 Photos: Mass shooting at Las Vegas music festival Police and emergency responders gather at the intersection of Las Vegas Boulevard and Tropicana Avenue. Hide Caption 22 of 30 Photos: Mass shooting at Las Vegas music festival A police officer takes position behind a truck. Hide Caption 23 of 30 Photos: Mass shooting at Las Vegas music festival A crowd takes cover at the festival grounds. Hide Caption 24 of 30 Photos: Mass shooting at Las Vegas music festival Police officers advise people to take cover in the wake of the shooting. Hide Caption 25 of 30 Photos: Mass shooting at Las Vegas music festival People tend to a victim at the festival grounds. Hide Caption 26 of 30 Photos: Mass shooting at Las Vegas music festival Police stand at the scene of the shooting. Hide Caption 27 of 30 Photos: Mass shooting at Las Vegas music festival A woman sits on a curb at the scene of the shooting. Hide Caption 28 of 30 Photos: Mass shooting at Las Vegas music festival Police are deployed to the scene. Hide Caption 29 of 30 Photos: Mass shooting at Las Vegas music festival A man makes a phone call as people run from the festival grounds. Hide Caption 30 of 30

Police said Paddock, of Mesquite, Nevada, killed 58 people and wounded about 500 others . A nurse, a special education teacher and kindergarten teacher are among the dead. Police are trying to piece together a motive.

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Paddock killed himself in his hotel room, where police found 23 guns, said Clark County NV Assistant Sheriff Todd Fasulo. Fasulo said another 19 guns were found in the gunman's Mesquite home, where police searched.

"We believe Paddock is solely responsible for this heinous act," Fasulo said.

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'You kept hearing gunshots'

Short, 18, said people paused when they heard the gunshots at the Las Vegas Village, a 15-acre greenspace outside the MGM Grand hotel. Concertgoers at the Route 91 Harvest country music festival thought it sounded fireworks, she told.

That's when Short and her friend turned around and started running. Short said she dove under a bar to take cover.

"You kept hearing gunshots. They just weren't stopping," she said.

'Please get me out of here'

As she lay wounded, Short said the good Samaritan used his belt to wrap her leg, an attempt to stop the bleeding. She wanted to talk to her mother.

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"Please get me out of here," she said to the man, a stranger to her.

"He just picked me up and threw me over his shoulder," said Short, a Las Vegas resident. The man carried her to a taxi that took her to the Sunrise Hospital and Medical Center.

"It was just the scariest experience of my life," Short said.

As she sat in her hospital bed, she thought about the people who lost their lives and those who were severely injured.

Short said her mother, a police officer, usually works the festival. She had signed up to work it again this year but didn't get duty this time.

"I don't know what I would've done if she was there and she would have got hurt, too," Short said.

This article has been updated to reflect a change in the victim death toll.