LOS ANGELES (CBSLA.com) — Fourteen-year-old Jordan Peisner was walking out of a Wendy’s just down the street from his San Fernando Valley high school on Friday when he says he was randomly attacked by a teenager he had never met.

“The guy just came up from behind and sucker punched me right here,” Peisner, a freshman at El Camino Real Charter High School said, pointing to his head.

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The punch fractured Peisner’s skull, ruptured his ear drum and caused swelling and bleeding in his brain.

Peisner was airlifted to Children’s Hospital Los Angeles, where he remained under the care of doctors Monday.

The teenager who carried out the attack was arrested Friday, Peisner’s father, Ed, said. Police have also questioned the teenage girl who took a video of the attack and posted it to the social networking app Snapchat.

“It’s a cowardly move,” Ed Peisner said of the attack. “But the person who followed him and filmed it is equally at fault.”

Several teens who witnessed the assault also recorded the aftermath of the attack on their cell phones.

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Four days later, Peisner’s family is struggling to see any possible explanation for the attack.

“My son’s brain was bleeding because someone wanted to see a video?” Ed Peisner asked incredulously. “Four days later I am trying to process it, and I get chills and tears.”

Peisner’s condition is improving, doctors said, though he’s still suffering from severe headaches and is sensitive to light. It’s unclear if he will have any long term effects from the attack.

“His life was changed in two seconds,” Ed Peisner said.

Jordan Peisner hopes to return home Tuesday.

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A GoFundMe page was set up to help pay Jordan Peisner’s medical bills and other injury-related expenses.