He was surrounded by people. If he missed on, he just hit the one behind them.
Additionally, I am not totally convinced that the "victim" who has since been arrested was in fact wounded. He is so far "out there" that I would not be surprised to learn that he managed to self-inflict a minor injury to give himself a platform from which to gain attention for his own views.
I could be wrong about that, of course. It would be interesting to see his wounds or a good medical description of them.