It was holding its weekly country music and dance night at the time of the shooting.
Investigators believe Long arrived Wednesday night at the bar in a auto, shot a security guard who was standing outside and then stepped inside.
Long was armed with a Glock 21, a.45-caliber pistol created to hold 10 rounds plus one in the chamber, according to the sheriff.
People "dog-piled on top of each other" trying to hide in silence, she said. They had chairs and threw them out the window, and they were able to take me and my girlfriend out the window and carried us out here.
A person who was a friend of Long's until their early 20s and who did not want their name revealed publicly similarly said they used to go to Borderline together.
"Yeah. I'm insane, but the only thing you people do after these shootings is "hopes and prayers". or "keep you in my thoughts"... every time... and wonder why these keep happening..."
The Borderline Bar is popular with students and was hosting a line-dancing night when the attack happened.
Telemachus's Facebook page was filled with comments such as "Watching Godzilla after work always a good time" and "Let's go Chargers!"
In a joint statement, the couple said: "Alaina was an incredible young woman with so much life ahead of her and we are devastated that her life was cut short in this manner".
Reverend Shawn Thornton described her as artistic and a leader in church activities, who worked part time helping with children's programs at the local church and majored in art at nearby Moorpark College. "It sounded really weird", she said. The website Niche named it the third-safest city in the United States in 2018. I ended up getting caught in the ground and stumbled over by multiple people. Because I was against the wall, I was OK.
Long's friends say he was a frequent visitor at the bar for years and that he liked going there.
Tristan Appleby said he watched everything unfold from across the room.
"Luckily, he didn't come my way", Appleby said. He reportedly diverted the gunman's attention, saving the lives of others.
Sgt. Eric Buschow, who said Helus was a friend, described him as a "cop's cop". It is not known if the bouncer survived. When the gunman burst in, her friend, Cody Coffman, yelled for her to get down.
"(He) said to her, 'Hey I got to go handle a call.
"We will be sure to paint a picture of the state of mind of the subject and do our best to identify a motivation", Delacourt said, adding that the FBI would investigate any possible "radicalization" or links to militant groups. He told the Reuters news agency that he saw the shooter enter the bar and stop at the counter.
"In this community, it's very hard for me to comprehend it because I've been here all my life and to think that - I've never experienced it, I've just never experienced it", Sigman said. "I didn't know what to do". God brought us together for a reason and I will hold our memories in my heart forever.
Killer Ian David Long.
Sheriff's Sgt. Ron Helus and a passing highway patrolman arrived at the club about 11:20 p.m.in response to several 911 calls, heard gunfire and went inside, the sheriff said. The gunman exchanged gunfire with Helus, fatally wounding him.
Helus was among the first officers through the door at Borderline. Police said he killed himself.
Police found patrons holed up in the attic and knocked on the door, telling them it was OK to come out.
Police said the gunman was found dead inside the bar on the outskirts of Los Angeles although it was not immediately clear if he was killed by officers or shot himself.