Benson jumped to his feet. He didn't know how Brian had found him, but he couldn't worry about that right then. After all, he had no idea what Mallory had been texting the guy, so maybe she had said something to make him guess where they were. None of that mattered, though; what mattered was that he wasn't going to let Brian mistreat Mallory in front of him.
"Hey! Don't touch her!" Benson shouted, pushing the center of Brian's chest with one hand and easily prying Brian's hand off of Mallory's arm because he was so taken by surprise.