COLLEGE PARK, Md. — As media waited for Gary Williams’ post-game press conference, the lights went out in the auxiliary gymnasium where the Maryland coach speaks to reporters after games. It was an appropriate ending to a disappointing night for the Terps in an 80-62 loss to No. 5 Duke, a game in which Maryland tried to climb back in it at several points behind an electric atmosphere at Comcast Center. Poor shooting, the surrendering of second-chance baskets, and lackadaisical perimeter defense spelled out what anyone who watched Wednesday night’s game could plainly see. “It’s a team thing,” said Williams, questioning his team’s energy level much like he did after a home loss to Virginia Tech two weeks ago. “You have to be ready to play. You have to believe that you can win that game. That’s what we have to work on.” To beat Duke, Maryland (14-8, 4-4 ACC) needed to play a near-perfect game to compensate for their deficiencies on the perimeter, using its size and playing tough defense (ranked ninth in the nation in opponent field-goal percentage entering Wednesday night’s game) to knock off the more-talented Blue Devils. The Terps did neither as Duke (20-2, 7-1 ACC)