what led mrs.hall conclude that the stranger was a spirit?

Chapter please?

When griffin was returning to his room after doing burglary at vicarage , the halls noiced their unbolted main door. They went to griffin's room and suddenly the bed clothes gathered and moved over the bottom rail of the bed . Then , the stranger's hat flung itself against mrs hall's face . The sponge from the washstand followed the hat. Then the chair went up in the air and came charging at mrs hall. The poor lady screamed and turned her back. While other things were flinging themselves , a vicious laughter , resembling to stranger was heard. This made halls believe that griffin was a spirit himself who was responsible to make the furniture mad. HOPE THIS HELPS U