Severus' eyes narrowed. Threats weren't going to work - he would have to try to sort this out in some way that didn't end in cursing her all the way down the street. She was obviously quite hopeless, and he couldn't stand around trying to reason with her when there was nothing to reason with in the first place. He could feel his face starting to burn out of irritation, sheer irritation.
"Listen to me," he said, straightening and glancing away - he was very good at reading faces, and there were some things he emphatically did not want to read. "Here's what you're going to do: you're going to go sit in - in the Three Broomsticks," where at least she wouldn't have her pocket picked, which was always something of a risk at the Hog's Head, "and you're going to wait. Do you understand? Three hours." He held up three fingers, just in case. If she wanted to assume he'd be coming back to join her, that was all to the good. Let her come to her senses alone.