A fellow high school English teacher like I am, I am wishing a speedy recovery for Jim Addlespurger. It is fortunate hitting his head like that didn't do more serious harm.
In hindsight, I guess the mistake the 50-year-old teacher made, besides being in the wrong place at the wrong time, was in not turning around and heading the other way when the pack of five or six young black males--and this word perfectly fits--shambled their way towards him in an alleyway.
Just watch the video. The level of savagery is appalling.