"We prepare for mass destruction, earthquakes, natural disasters, but we don't prepare for 180 patients all being shot come in just to our hospital."
Jon Dimaya is describing the night he led a trauma team treating nearly 200 gunshot victims.
"And that's not all of them," he told 7.30
"They went to other different hospitals, they went to my wife's, they went to all the different hospitals in the valley."
Mr Dimaya was actually off-duty when the gunman's bullets rained down into the crowd attending the Route 91 Harvest Festival.
His called his wife Angie, who was on duty at another hospital, to ask if he could lock their four kids inside the house and head to work.
She agreed and he arrived at work for a night unlike any other.
'It was gruesome, I've never seen anything like it'
"Everyone was a gunshot wound, it wasn't, 'What happened? How were you hurt?'," Mr Dimaya said.
"It's, 'Where are you shot?' That was the question of the night.
"Follow the trail of blood and see where they're shot and do what you need to do.
"It was gruesome, I've never seen anything like it.
"I said something about the housekeepers and I keep thinking about it ... I must have bumped into every one of them cleaning the floor every minute, it was stained in blood the whole time.
"They couldn't keep it clean."
'When I turned around he wasn't standing'
Mr Dimaya said he hopes he never sees another work night like it.
"I've seen scenes like that, where people are crying and screaming and hurt," he said.
"I've seen family members come in and be distraught and its nothing, nothing even remotely close to what I saw that night.
"Loved ones were separated moments before. They didn't know.
"Some of the things they said to me were: I was holding my husband's hand and I lost him. I got pushed away from him and when I turned around he wasn't standing. I don't know if he's alive can you find him for me?"
Mr Dimaya said he would try and find family members, but the simple truth was if they were not at the hospital he did not know if they were alive.
'We have tragedy after tragedy'
Angie and Jon traditionally debrief after the night shift — she had victims at her hospital too but nothing on this scale — and Angie's immensely proud of Jon.
"To me he's just my husband, but to other people he's so well respected and so admired for the work that he does, and he's probably one of the smartest nurses I know," she said.
Mrs Dimaya hopes the massacre will change gun laws — Nevada has one of the worst records in the country.
"I was raised in Nevada. I was born here, so we were raised shooting and by the time you're 12 years old you get your hunters safety license and you hunt," she said.
"I think that guns have a use. I think that having a semiautomatic weapon or an automatic weapon and shooting 600 people at a concert is not the use for it."
She said she hopes people in the nation's capital will listen.
"I don't know what our elected officials in Washington are doing if they're not stopping this," she said.
"I mean, when is the time to stop it? We have tragedy after tragedy and it's all because of automatic weapons."
'It's blessed to be alive'
Two days after the massacre, remarkable survival stories are emerging.
Nadia Dascal was working on stage at the festival and was told to take a break one minute before the shooting.
"That friend that said to us go on the break, that's actually, I think he saved our lives because he did get shot," she said.
"He just got hurt. He's OK now, he's home recovering."
Ms Dascal hid with her friend Marcela Alves who both have young children.
They cannot stand watching the news reports anymore and just want to watch Disney movies with their kids to block out the memories.
But it is something they will never forget.
"For both of us, we're going to live with this," Nadia said.
"I think this time we'll enjoy life more because this is like a second chance. It's blessed to be alive."