The witches are manipulating Macbeth in this scene, which is where he first meets them.
In the beginning of the play, the witches tell Macbeth that they have three prophecies for him. We have met these particular witches in Act 1, Scene 1 when they discussed how they would meet Macbeth later. The prophecies tell Macbeth that 1) he will be Thane of Cawdor, 2) he will be king, and 3) Banquo’s sons will be king.
The interaction between Macbeth and the witches is an interesting one. His friend Banquo, for example, is suspicious of the witches from the start. Macbeth, on the other hand, is intrigued by what they have to say because he likes what they have to say. They are pricking his ambition. Even though Banquo is also told something he would supposedly like to hear, that his sons will be king, he is not as interested.
Banquo seems disturbed and possibly frightened by the witches from the start.
What are these
So wither'd and so wild in their attire,
That look not like the...
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