Macbeth discovers for his future that his time as king is limited. He has learned that Fleance, Banquo's descendant, will become the future king of Scotland. This can be illustrated by the "adult snake [that] lies, [and] the worm that in time escaped from nature will reproduce the poison [without] teeth present." (Shakespeare Act III, iv, line 32-34). It is evident that Macbeth speaks of Banquo's death as an adult serpent, it is no longer a detriment to Macbeth's control for supremacy. But Fleance, the "worm", has escaped. Macbeth is not too concerned with how he will kill him rather than the future of his destiny as king. This supports the fact that Macbeth does not think clearly and can be seen as paranoid in wanting to reside as king forever. “It is notable that the ghost always appears as soon as Macbeth mentions Banquo” demonstrating that seeing various inanimate objects that normal people cannot see gives clues that Macbeth is disillusioned and mad (Vince). This also adds to the plot and creates more tension than necessary as Macbeth begins to unravel himself as the play progresses due to the guilt of killing the former king.,