Why would anyone, let alone a group of 10-15 teenagers feel the need to attack an innocent person? Chase them down and hurt them and than steal their wallet?  What in the world are these parents doing? My mother would have killed me herself if she ever found out I was treating anyone that way.  As far as any by standers that were possible in the area, I truly hope that they came forward and these individuals were arrested and detained.  They are obviously a dangerous group of kids, who know right from wrong, but for some reason, they don't think the law applies to them.