A man riding his bicycle through Madison’s Warner Park Wednesday night says he was attacked and knocked out by a teenager. The victim’s name hasn’t been released. He says a group of teens laughed at him when he fell off his bike at about 8:45 P-M. He told them they were being disrespectful, then started riding away when one member of the group showed a handgun. That’s when he says the teenager chased him down, pushed him off the bike and knocked him unconscious. The man suffered fractured facial bones.