Duke University sued its star quarterback, Darian Mensah, on Tuesday, alleging that he had agreed to stay in Durham before he made a last-minute announcement that he would explore transfer opportunities. Mensah, the second-team all-ACC signal caller who led Duke to its first outright conference football title since 1962 , stunned the school last week when he announced he'd be transferring . Enrolling and playing for another school would allow him to license his name, image and likeness to that