Norrell's small, sharp eyes flit up and around the shelves himself as they begin to tremble -- widening in alarm. Confirmation, then, that this woman is a witch perhaps? Or something else. Has some degree of fae magic on her. To think! He has allowed her here, into his study, and perhaps... Perhaps she has only come to spy on him! To try and steal his secrets for another! He rushes to a shelf to try and steady some things, remove breakables down to a safe level.

"Make her stop," he hisses at Childermass, for the safety of his books is paramount!