CHICAGO (CBS) — A 29-year-old Wicker Park resident would like to find the man who has complicated his life for the next four months, after a complete stranger bit his arm and attacked a friend at Lollapalooza.

Ben Lenet was watching the Arctic Monkeys on stage with two friends at about 9:30 p.m. Friday, when a man in the crowd attacked one of his friends.

Lenet said he tried to pull the man off, and that’s when the man bit him hard, drawing blood.

“And fully locked his jaw into my left forearm,” he said.

Lenet said he and his friends started hitting the man to get him off, but when he finally let go, he tried to bite the first man he attacked, and one of Lenet’s friends kicked the man in the face.

The man got up and walked away as if nothing had happened.

“In describing it to the police later, they said ‘We never see cases like that where the attacker isn’t on PCP, or bath salts, or something like that,” Lenet said. “There’s no way a normal person could have sustained that much punishment, and just walked away.”

Lenet was treated at Lollapalooza, and at a hospital.

As a precaution, he was given HIV cocktail drugs, and has to come back for HIV testing in 30 days; and again in four months.

“Anytime anyone says to you; when you talk about your exposure to AIDS or hepatitis, it’s scary. I’m a smart guy and I recognize the risk here is low. I’m probably fine,” he said. “In four months this will probably be a pretty crazy story to share with friends over a beer, but it is very present on my mind right now.”

Lenet started at thread on Reddit, sharing photos of his injury, and asking anybody who might have information about the man to come forward.

“I can only describe [him] as between 5’7” and 5’11”, dark skin (maybe Hispanic, but not black), 170-210 pounds,” he wrote on Reddit.

Lenet said the attack put him off going back to Lollapalooza for on Saturday and Sunday, and he said he’s “done with Lolla for a while.”