Antonin Dolohov was the second most likely person to have hired the man to stalk her around Edinburgh. It would be like him to leave her locked in a basement with no food or water for days. Give her lots of time to think over her actions and begin to lament her follies. He'd want her good and compliant when he swooped in to drag her back home. He liked to break people. Make them desperate and needy. Clearly, the man had never known any real love in his life.