A number of survivors of that shooting, the worst in modern U.S. history, have said they were at the bar on Wednesday.
The venue in the quiet, upscale Thousand Oaks suburb was hosting an event for college students, with several hundred young people in attendance.
Ms Whittler said she didn't have time "to think about why this is happening", and just focused on a way to "get out".
The assailant, identified as Ian David Long, a troubled former machine gunner who served a tour in Afghanistan, died of a self-inflicted gunshot wound.
Long used a.45 caliber Glock handgun, which was purchased legally, Dean said. "No more NRA, no more money, gun control now, thank you". The device is illegal in California.
Helus rushed toward the shooting and immediately exchanged fire with the shooter inside the bar, Mr Dean said. "Obviously he had something going on in his head that would cause him to do something like this".
Thirteen people died, including a sheriff's deputy and the suspected shooter.More news: Arsenal's Danny Welbeck suffers leg injury against Sporting
Investigators are still piecing together a precise timeline on the shooting that killed 12 bar employees and patrons.
"Guy, run! He's coming out this door", Knapp can be heard saying. "Sometimes we'd go there to have a drink, sit and talk, listen to music", she said.
"He shot a lot, at least 30 times".
Paddock killed 58 people, before turning the gun on himself in the worst mass-shooting in USA history. "It could have been much, much worse", he said.
"He said Helus was on the phone with his wife when he got the report of the shooting and he told her, "'Hey, I have to go.
Hanson described Long as an introvert and said he was "dumbfounded" by the massacre.More news: Assistant coach Foster says Shields came 'very close' to All Blacks selection
"I was concerned because I knew he had been in the military", Tom Hanson said.
The police called in a team of mental health specialists who decided that Long did not qualify to be involuntarily detained for mental health evaluation under state law.
Long had no criminal record.
Authorities urged the public to avoid the area. God bless all of the victims and families of the victims.
The shooting has left many in the community understandably stunned, including Ventura County Sheriff's Office Sgt. Eric Buchow.
Thousand Oaks is in Ventura County, about 40 miles from downtown Los Angeles.
Federal Bureau of Investigation data suggests that Thousand Oaks is the third-safest city in the country.
California already has some of the strictest gun laws in the country, but on Thursday, governor-elect Gavin Newsom promised he "will raise the bar" on gun control when he takes over in January. Caty Weaver was the editor.More news: Lakers sign Chandler to fill need at center