I watched the video and was frankly shocked that after the driver mows down 11 people, he calmly gets out of the car and walks away without rendering any aid to the guy laying on the ground in front of him. Unbelievably callous. I'd be surprised if this guy doesn't end up in jail for this.
Edit: There is no way he had PSM engaged. These cars just don't break loose like that on dry pavement. He was probably trying to squeal wheels for the crowd and turned PSM off.