This, to me, doesn't look like the title would imply... Photo wise, it looks like horribly difficult lighting. Did you use any flash? I think it would have helped to bring out his features.
TC
You picked a good subject in bad lighting conditions. It's important when you are doing a portrait (even candid) of just a single person that you really watch your background... also I'm feeling that you might have gotten a more interesting moment from this guy. I'm guessing the group were playing for a while? How many shots did you take?