When you realize an opponent is going to beat you to a ball, you have a few options. Elbowing them in the face should not be one of them, though. They tend to take exception to that kind of action, as you can see in this clip.
The impressive part of this incident, however, is how quick the kid who got elbowed scrambled back up and started his attack. We won't name any names, but I'm sure we can all think of a few footballers who would still be clutching their face and rolling around on the ground had they been on the receiving end of that elbow.