Cruel Tyrant ~ Act 4 ~ In this Act, Macbeth goes back to visit the witches, they tell him a further 3 prophesies:
1. "beware Macduff"
2. "none of woman born shall kill Macbeth"
3. Macbeth will be safe until "Burnam Wood" goes to "Dunsinane"
This makes Macbeth feel invincible however, he is twisting the prophesies to make it suit him. Macbeth feels undefeatable, but to make sure, he kills Macduff's family.