Marc, still confused about what had happened but at least with an idea of how to solve it, noticed Dia and nodded to her as he passed her. Then he stopped and turned; with his mind mostly on Benjamin, Simon and Sara - her accusations had hurt - it had taken a moment to process the fact he didn't know who he had nodded to. His eyes quickly took in her face and he concluded he really hadn't seen her before. 

"You're new here, aren't you?" he said. "I didn't hear about anyone new starting today..." he frowned, nor was there anyone new on the roster. He stepped closer to her, but he seemed curious rather than hostile. "Who are you?"