Act 2 Scene 1: Banquo runs into Macbeth late at night. Banquo inquires about the witches and how he thinks what they are saying is coming true for Macbeth. Macbeth denies ever thinking about the prophecy. He is trying to make it seem like he doesn't believe in what the witches said. He then hallucinates a dagger and decides it is from his uneasiness about killing Duncan. He hears the bell and proceeds to where Duncan is sleeping.
"I dreamt last night of the three Wëird Sisters. To you they have shown me truth."
"I think not of them."
"A dagger of the mind, a false creation proceeding from the heat-oppressèd brain?... Words to the heat of deeds too cold breathe gives."
Scene 2: Macbeth returns from killing Duncan and is in shock from what he has done. He explains to Lady Macbeth that he can't say the word "Amen." She tells him that he will go crazy if they think to much about it. Macbeth is feeling the guilt of killing him as he can't go back to leave the dagger with the body. He is also hearing things and stares at the blood on his hands. Lady Macbeth calls him a coward and leaves.
"We can’t think that way about what we did. If we do, it’ll drive us crazy."
"But wherefore could not I pronounce “Amen”? I had most need of blessing, and “Amen” Stuck in my throat."
Scene 3: Macduff and Lennox arrive and ask to Macbeth see Duncan. Lennox tells Macbeth about the storm the night before and Macbeth says that he thought everything was calm. Macduff goes to wake him up and comes back announcing that he is dead. The sons of the dead king arrive and they decide they need to flee. Macbeth confesses to killing the guards in his anger over the death of a man he was loyal to.