Nice color tones, great bokeh, and clarity. Love the DOF, but can't help wanting to see this same composition stopped down one stop to see what a LITTLE more definition of the action in the background would look like. If it would be at the expense of the bokeh then I would say that you made the right call...no pun intended! 8
Good shot and a good representation for the challenge. I think the one thing that could be changed in this picture to help tell the story better would be to use greater depth of field to allow the background to be slightly more in focus to really portray the football reference and show the referee in his environment better.