How are the Montresor family motto and coat of arms appropriate?

The Montresor family motto, "Nemo me impune lacessit," meaning "No one attacks me with impunity," underscores the family's emphasis on revenge and the consequences of disrespect. Their coat of arms features a dark figure trampling a snake, which symbolizes Montresor's ruthless nature in overcoming enemies. Together, these elements reflect Montresor's character and his relentless pursuit of vengeance against Fortunato in Edgar Allan Poe's "The Cask of Amontillado."