The victim says he was watching the Arctic Monkeys at about 9:35 pm perfectly sober ("All subsequent police and medical professional even remarked how odd it was dealing with someone so sober," he wrote) when a man, which he describes as being "between 5'7″ and 5'11," dark skin (maybe Hispanic, but not black), 170-210 pounds" body slammed his friend and started choking him.

"I come from the other side and place my right arm on his right arm and my left arm on his right shoulder trying to pull him off," he wrote. "The attacker then turns his head and clamps his teeth into my arm for a good 5 seconds. He's not nipping at me. He's trying to bite through my arm."

The assailant, according to the victim, then got up after taking 10 to 15 blows to the head and walked away. The Chicago Police Department told the victim that they've only see assailants act like that when they are on PCP or bath salts.