The famous video of September 29's biker-gang incident cuts off just as Alexian Lien, the driver of the SUV, was being attacked at a red light. Now a new video (or newly discovered? — it was posted to YouTube on October 1) documents part of the attack itself. The short, seventeen-second clip shows at least seven bikers surrounding and kicking Lien as he lies on the ground. A Good Samaritan walks over and tries to disperse the bikers. And that's it. It's not clear if any one of the bikers in the video is the undercover cop who was arrested tonight for his part in the assault.