Someone's in for a "SURPRISE"

This youngster (and his unseen friends) are making the most of the crags along the eastern side of Square Willette to play their games.

 
 
He had been just standing there,
suddenly he heard a noise,
someone's approaching,
and....!
 
 
 

In a moment, two friends came charging up the steps, and they were all off again.

                    ...and in another moment, so was I.