Pip’s left arm had suffered very bad injuries but his right arm had been minor. Herbert visits him and helps him clean and dress the wound. While Pip had been away Herbert tells Pip that he heard from Magwitch that he had been married. He had been married to a crazy woman who was jealous and killed another woman and threatened to kill her own daughter. This is obviously the same story by Wemmick. Compeyson knew this story and used it to blackmail Magwitch. Pip realises the obvious.