Kicked in front of his girlfriend

I was out with my friend and we were sitting on a bench doing nothing, when we saw a fight broke out between two guys. One of them was accompanied with a friend and the other one had his girlfriend with him. When the two were fighting, the guy kicked the other guy who was with his girlfriend in the balls so hard right in front of her. He immediately clutched and fell down. The fight ended and we could see his girlfriend comforting him, rubbing his back while he was rolling and groaning on the street. There weren't a lot of people on the street there. We felt bad for the guy. We left the place maybe after 10 minutes. While we left, the guy was still on the street rolling around holding his balls. I would just like to know your thoughts on this