Norrell makes a sound of distress as his vase hits the ground, continues to hurriedly rescue things from shelves. He risks a look over at Nancy, at her face as she attempts to plead with him. Some of it gets to him, in truth, but the danger of her magic making his things fall from shelves is a distraction from his sympathy. Takes away a good deal of it.

"Make her stop," he snaps again -- more meaningful this time. Either she stops the magic or Childermass has leave to force her to, however he chooses. Norrell cares little which it is, so long as his books are safe. He could simply ask her, but Norrell is not the kind of man to ask a person nicely when he feels harried.