Everything you need to understand or teach The Cenci by Antonin Artaud.
Andrea is Cenci's servant.
The two mute assassins employed to kill Cenci make two unsuccessful attempts before murdering the count. Orsini, who describes them as "brutish, dull-witted scoundrels who would kill a man as unthinkingly as we might tear a piece of paper in two." The reason the assassins fail twice in their attempted murder of Cenci seems to be a combination of incompetence and cowardice rather than any feelings of guilt...