The Wendigo was gaunt to the point of emaciation, its desiccated skin pulled tautly over its bones. With its bones pushing out against its skin, its complexion the ash gray of death, and its eyes pushed back deep into their sockets, the Weendigo looked like a gaunt skeleton recently disinterred from the grave.
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.