Shakespeare builds tension in the play by having the witches mysteriously appear and dissapear. Through dramatic irony he is giving the audience more information about the witches then the characters. They are thinking whether to trust the witches or not, but we already know that they shouldn’t.
In the start of Act 5 of Twelth Night, Antonio got mad at
Cesario--whom he still mistakes as
Sebastian, because Cesario agrees that Antonio seemed like a crazy person. Antonio
saved him from Sir Toby and Sir Andrew, yet Cesario was indifferent to him when
he was arrested.