significance: This proves Banquo's ideas that Macbeth is not fit for king. When Macbeth wants Banquo killed, he can't do it himself and puts his work on others claiming that they are best fit. Although the murderers may have had an aptitude for killing, they were not agains Banquo until the king had told them to be, proving that Macbeth had the most hate and most reason to kill.