Up-and-coming country star Luke Combs had just started his set on the smaller of the two festival stages when Kody Robertson, an auto-parts salesman from Columbus, Ohio, squeezed in at the end of the bar next to Michelle Vo, an insurance agent from Los Angeles.

The 32-year-olds connected immediately. They joked about their mutual love of golf. He recommended new beers for her to try as she showed him the large floral tattoo covering much of her back. They realized that they were both staying at the Luxor.

Michelle Vo The Washington Post

A longtime country music fan, Robertson was in Las Vegas with a group of friends and told Vo about the fun they’d had at last year’s Route 91 Harvest festival. Vo replied that she’d only recently fallen for the genre. This was her first festival, and she was here alone. By the time the night’s final act took the main stage, the fast friends had settled into a spot about 20 yards from the right side of the stage, nestled between a few cuddly married couples and a rambunctious bachelorette party.

Then the first shots were fired.

It was 10:08 p.m. Robertson and Vo searched the air for the fireworks they assumed they were hearing. Then came a second burst: indiscriminate gunfire hailing from a 32nd-floor window at the Mandalay Bay Resort and Casino.

Screams punctuated the pop-pop-pop. Jason Aldean, the headline act, ran from the stage. A bullet pierced the left side of Vo’s chest.

“She got hit and I turned and saw her immediately fall to the ground,” Robertson recalls. “She was literally right beside me, maybe 2 feet away.”

Robertson threw his body on top of hers as a shield from the bullets and, when the firing finally seemed to stop, worked with another man to carry Vo out of the venue – pausing for cover each time the gunfire resumed.

Sunday night’s massacre in Las Vegas – the deadliest mass shooting in modern American history – left at least 58 people dead and 527 injured. It was a scene of romance and carefree revelry, an occasion meant to be shared with loved ones and foster new friendships.

That scene turned tragic when a stream of hundreds of bullets came down on the open field, prompting many to shield the people closest to them – often relatives, best friends, spouses and in some cases, new companions.

Among the countless couples swaying in the crowd of 22,000 people were Bobby and Jenny Parks, high school sweethearts from Lancaster, California.

When the gunshots began and Jenny fell to the ground, Bobby thought Jenny had fainted, his uncle Steven McCarthy later recalled. Then, realizing what was happening, he covered her with his own body. He felt the blood. His wife of 15 years had been shot in the head.

Jenny was hit a second time, the bullet traveling through her body and striking Bobby in the arm.

She died as he held her.

Elsewhere on the field, Jack Beaton, 54, of Bakersfield, California, was telling his wife “I love you, Laurie,” for the last time as gunfire erupted around them. They’d come to the concert as a celebration of their 23rd wedding anniversary.

“I love you too,” Laurie, 49, declared back.

Then the bullet struck. Beaton died in his wife’s arms.

Robert Eardley of St. George, Utah, was trying to save his boyfriend, Cameron Robinson, carrying him through the crowd in search of a vehicle that could take him to the hospital. Robinson had recently moved into Eardley’s house, even though it meant his daily commute to work would be more than 100 miles.

He had wanted to make sure they were together. Robinson died before reaching a hospital.

Carrying his new friend Michelle Vo through the same crowds, Robertson, the Ohio salesman, spotted a white pickup truck whose driver was headed to a hospital. He set Vo down on the truck bed then ran back toward the stage.

Clusters of bodies lay crumpled on the ground as bullets dinged the metal roof of the bar near the back of the venue.

In the heartbeats between rounds, Robertson and other would-be rescuers ran from person to person, checking pulses and pulling bleeding bodies to safety.

“We put a girl on a beer cooler to try to push her out; we were carrying people out on the steel barriers from the perimeter,” Robertson said. “Wives screaming at husbands to wake up, and a husband on top of his wife trying to do CPR.”

Then he saw it: Vo’s purse, on the ground near where they’d been dancing.

Her phone wasn’t inside, so he furiously called the number Vo had given him earlier until, finally, someone answered. Another group of concertgoers had found the phone as they ran for the exits. Robertson could pick it up at Planet Hollywood.

By the time he retrieved it, Vo’s phone was full of frantic text messages and voice mails, which he couldn’t open without her passcode.

The blood covering his jeans and arms had begun to dry a dark crimson when Vo’s phone buzzed again in the early morning hours.

“Please tell me that she’s OK,” Jeremiah Hawkins, 37, the husband of Vo’s oldest sister, begged through the phone.

Robertson relayed what he knew: She had been shot in the chest and taken to a hospital. He’d keep going to hospitals until he found her. He promised.

At Sunrise Hospital, a hospital worker pointed Robertson to the auditorium where the families and friends of the unaccounted for were gathered.

Early morning stretched toward lunch. Robertson ate a doughnut. The coffee went cold.

The news came about 11 a.m. Two doctors and a counselor led Robertson to a small back office. “Michelle didn’t make it,” one of the doctors said. “The wounds were too much. She didn’t make it.”

Vo’s family landed Monday afternoon – a sister, a brother-in-law, some friends – and quickly made their way to the south tower, Room 11375, where Robertson was staying.

“Kody was our guardian angel,” said Diane Hawkins, 40, Vo’s oldest sister, who believes that had Robertson not tracked down her sister, their family would still be searching for her. “He refused to let her be alone.”