Photojournalism

This is a shot (rejected) from my first sports outing.  The part that interested me was the expression of the official.  He is running with a group of defenders, chasing the pass receiver who got away, and he appears to be very happy.  So why is he beaming: does he simply appreciate a great action play, or is that one of his relatives racking up the yardage?  Another question could be the ethics of officials displaying any enjoyment of the game.  There was a possibility of a feature here, but that would be more obvious if the few defenders were a big thundering/menacing herd.