He fears him because he actually has an heir.
Macbeth
What is the deed of dreadful note that MacBeth refers to in this scene?
His plan to have Banquo and Fleance murdered.
Do the murderers succeed in their plan?
No. They kill Banquo but Fleance escapes.
What will the witches do when they see MacBeth tomorrow?
Ensure his ultimate demise by making him overconfident.
Why is Macbeth worried about Banquo?
The witches predicted his son would be king and he is afraid Banquo might turn on him.
Which character has missed two main events?
MacDuff
What does MacBeth do about Banquo?
He hires murderers to kill him and his son.
Why does MacBeth envy Duncan?
He doesn't have to fear anything anymore since he is dead.
What is Banquo's dying wish to Fleance?
To seek revenge on his death.
Does MacBeth know what Macduff has done? How do we know?
Yes. He is preparing for war.