PHOTO: Millbrook running back Xavier Pugh. By TOM SHANAHAN Millbrook High’s running game needed something extra last week. The Wildcats, known for their explosive passing attack, faced top-seeded Hillside’s balanced offense in an East Region semifinal of the N.C. High School Athletic Association 4A playoffs. Xavier Pugh, Millbrook’s overshadowed running back, delivered — three times. The senior’s third rushing touchdown in the fourth quarter was the game-winner in a 19-14 victory. “Every game he got better and better…