Scott Pritchard: Tom is the one who saw you at Susan's. He's known about you all along, isn't that right? We do know what that means. If Commander Farrell is the man who was with Miss Atwell, then Commander Farrell is the man who killed Miss Atwell. And we know that the man who killed Miss Atwell is Yuri. Therefore, Commander Farrell is Yuri, quod erat demonstrandum.
Scott Pritchard: I am tired of weakness! I am faced with a grave problem, and I intend to resolve it quickly and cleanly.