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It is the internal imperfection in the hero that brings him down. It's also called the "tragic flaw". Macbeth's wish for power is a fatal flaw.
Fall of Nobility
It is where the character no longer has the noble status that he once had because of his fatal flaw. Macbeth is defeated ruining all he worked for.
It is when outside forces influence the character to act. The witches mislead Macbeth and Lady Macbeth pressures him to act even when he doesn't want to.
It is when the character ignores or missed chances to set things right and make better decisions. It's when they fall victim to the outside forces. Macbeth could have refused his wife's orders, but he did not.