Why is nuttel upset when mrs.sappleton talks about her husband going hunting?

Vera a little earlier, before Mrs SAppleton arrived, had made an instant story of how the house master along with his two nephews and a dog had gone hunting in the marshes two years earlier, had died in the marshes and may return any time as ghosts. Mr. Nuttel who had come for a treatment of weak nerves had believed this story whose fear was only increased when he heard Mrs. SAppleton also relating how her husband had gone for hunting who may return any time. Naturally Mr. Nuttel was upset at the possibility of the ghosts returning to that house soon, so he ran away, treatment or no treatment.