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But to be safely thus: our fears in Banquo Stick deep;" While he was able to murder Banquo, Fleance was able to escape. At that time, Macbeth’s worse fear was getting caught, and the fact that Fleance was able to escape got him worried. This was one of the moments in the book that Macbeth had shown any real emotion (fear) after killing Duncan.

This picture represents the fact that whenever Macbeth talks about his lost friend Banquo he realizes his utter monstrosity as it begins to tear away who he really is as the madness begins to seep out onto his face and in his actions.