How do Macbeth and Banquo regard their encounter with the witches right after they vanish?

I think they were kind of shocked and confused. Macbeth says that they must take time to process what they have heard and should speak about the matter later on.

MACBETH Give me your favor. My dull brain was wrought With things forgotten. Kind gentlemen, your pains Are registered where every day I turn The leaf to read them. Let us toward the king. (aside to BANQUO) Think upon what hath chanced, and, at more time, The interim having weighed it, let us speak Our free hearts each to other.