HEMPSTEAD, N.Y. — A little more than two weeks ago, the Maryland men’s lacrosse team limped into the NCAA tournament with its offense in tatters. Since then, the seventh-seeded Terrapins have engineered a stunning about-face during back-to-back wins, the latest a 14-11 upset of No. 2 seed Duke in a quarterfinal Saturday afternoon at Hofstra’s Shuart Stadium.