- Mycroft Holmes: If anything happened to Joan, I'd never forgive myself.
- Sherlock Holmes: Well, that won't be an issue. If anything happens to Joan, I will murder you.
- Kurt Yoder: You have to do something! Your brother, he's - he's insane!
- Mycroft Holmes: Yes, that's always been a matter of some debate within the family. Various experts have been consulted, but an exact diagnosis has proved elusive.