He grasped her hand and helped her up and stood close enough for her to lean on him in case she was unsteady. He handed her her books, while secretly hiding his sonic screwdriver in his pocket. She looked alright to him, but he was not so sure, which worried him slightly. When she asked her question he shook his head.
"Trust me, you don't want to know what that was. Best you never have to find out."