Possible Clues:

• Put a stop to
• Desist or refrain from
• Stop old-fashioned case getting damaged - certain about it?
• Sounds like knight to finish ¿ it's a consolation
• Ending is certain to include resolution of case
• That's enough to make her tell him to stop, by the sound of it
• Stop as rescue is organised
• Sounds like the way to tell the knight to stop it