Sherlock laughed softly when he realized what Anders was attempting to do. When Anders realized that no, Sherlock was not going to allow him move forward in line, he was obviously going to try to get someone to give him their drink. "That might work," he said after a moment. "But only if the person ordered what you're wanting. It might just be better to wait your turn in line."
He remained silent for a moment, considering something. "If you can get the woman in front of me to allow you to cut in front of her, I'll allow that." Because that seemed logical enough, right?