"If I had looked back, I might not be standing here," Wik said. "I might have been one of the ones who got hit."
Clackamas Town Center is one of the Portland area's biggest and busiest malls, with 185 stores and a 20-screen movie theater.
Holli Bautista, 28, was shopping at Macy's for a Christmas dress for her daughter when she heard pops that sounded like firecrackers. "I heard people running and screaming and saying 'Get out, there's somebody shooting,'" she told the AP.
She said hundreds of shoppers and mall employees started running, and she and dozens of other people were trying to escape through a department store exit.
Tiffany Turgetto and her husband were leaving Macy's through the first floor when they heard gunshots coming from the second floor of the mall. They were able to leave quickly through a Barnes & Noble bookstore before the police locked down the mall.
"I had left my phone at home. I was telling people to call 911. Surprisingly, people are around me, no one was calling 911. I think people were in shock," she said.
Associated Press writers Nigel Duara in Portland, Michelle Price in Phoenix and Manuel Valdes in Seattle contributed to this report.