Bilzerian once trained to be a Navy SEAL, and while he never became one, he often brags of his apparently deadly prowess.

“My greatest fear is that someone will break in & I won’t be able to decide what #gun to shoot them with,” he once wrote as a caption for a photo of his table of guns. There’s even an official Dan Bilzerian video game about shooting zombie women in the Nevada desert, and then in a city, with scoped headshots and bodies in the streets.

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But on Sunday night, in the real Las Vegas, the Instagram star found himself caught in the worst mass shooting in modern U.S. history. He saw a woman lying dead, he said.

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The scene after a gunman opened fire on concertgoers at a country music festival in Las Vegas share Share View Photos View Photos Next Image Police officers advise people to take cover near the scene of a shooting near the Mandalay Bay resort and casino on the Las Vegas Strip, Sunday, Oct. 1, 2017, in Las Vegas. (AP Photo/John Locher)

He turned a camera on himself as he walked, short of breath, from the killing grounds, and at first resolved to live up to years of online bravado.

“Trying to go grab a gun,” he says in the clip. “I’m f—— headed back. … Saw a girl get shot in the face right next to me, her f—— brains hanging out.”

But in the next clip, which briefly appeared on Bilzerian’s Instagram account and has since been plastered over the Internet, he stands in front of police lights, looking slightly dazed.

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“Um, they got one of the guys,” he says, no gun in sight, all fury gone from his voice. “I’m headed back. I don’t think there’s much I can do.”

So he went home, leaving fans to wonder whether one of Instagram’s most formidable stars was something different in real life.

Bilzerian, who could not be reached for comment, would later claim to have helped an injured woman that night, when at least 58 people were killed and hundreds were wounded.

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And some did see something admirable in his return to the scene, armed or otherwise, even if it was by then too late to help.

But for others, his flight from danger only proved what they always suspected.

“This is why children shouldn’t classify heroes by their followers or their photos,” wrote Dakota Meyer, a Marine veteran who received the Medal of Honor. “… Always playing ‘operator dress up’ and so so tough when the cameras are on. A woman just got shot in the head and you are running away filming. … Please stop trying to be someone your [sic] not.”

Whether Bilzerian really is the man he portrays himself to be has been debated ever since he first went viral, four years before the shooting, also in Las Vegas.

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He was a small face in the background at the 2013 World Series of Poker — with a woman by his shoulder, stroking his thick beard.

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For whatever reason, the clip spread.

As it did, details of Bilzerian’s bizarre lifestyle fueled the sensation around him, and his growing fame in turn fueled his eccentricities.

As GQ wrote in a profile, he was a “nosebleed stakes” gambler himself, having once lost $2.3 million on a coin flip. He grew up in an 11-bedroom mansion, and by his mid-30s had filled his Los Angeles residence with firearms (including a 20mm antitank gun) and half-naked women.

Both were featured prominently in some of his most popular social-media posts.

“A kind of Bruce Wayne-meets-Hugh Hefner for the social-media age,” GQ called him.

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But the Bruce Wayne half of the persona never quite matched up to reality.

Bilzerian once faked his own arrest to make a video, GQ wrote. It ended with him doing doughnuts in a police car.

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When he was actually arrested in 2014, on bomb-making charges, he cut a plea deal in which he was forced to record a 60-second public service announcement, in dull monotone: “When shooting exploding rifle targets, check with local and state laws.”

He lived in part off a trust fund from his father, a corporate raider once imprisoned for fraud, and has twice been publicly accused of violence against women:

Bilzerian denied kicking a woman in the face at an art show a few days before his arrest.

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And when a porn star accused him of breaking her foot during a photo shoot, the Instagram King threatened through his lawyer to countersue, win everything she owned and “probably blow it up with a mortar in the desert.”

These incidents haven’t seemed to hamper his celebrity.

What happened in Las Vegas may.

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“Good thing your seal training kicked it and you ran away from everything. #faketroop,” reads a typical comment on a photo demonstrating Bilzerian’s crane kick, posted shortly before the shooting:

Bilzerian told People he was on the Route 91 Harvest festival stage, hanging out with a singer, when shots began to rain down from the rifle-filled 32nd-story hotel room across the street.

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“I was pretty calm, all things considered, but I definitely ran to safety,” Bilzerian told People.

He really did see a woman shot in the head, he told the magazine, and took another injured woman to a hospital before returning to the scene — as promised — with his gun.

But the police had things in hand by then, Bilzerian said, so he went home.

“I don’t think it was heroic at all,” he told People of his actions. “I just wanted to do the right thing.”

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And by Wednesday, he wanted his critics to know it.

Early in the morning, Bilzerian tweeted a television image of himself in the aftermath of the shooting, showing him handling something — or someone — covered in a white tarp.

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Beneath the photo, he wrote a retort to Meyer and another Marine veteran who had mocked him after the shooting.

“Look another video of me not doing s— you 2 f—— morons should stick to s— you know about, like …”

The rest of the message is too obscene to paraphrase.

This post has been updated.