In Scene iv Macbeth has a banquet with the nobles. The murderers come in and inform him of Banquo's death and Fleance's escape. He returns to the table where the nobles are eating, and looks for a seat. Even though there is one empty, he cannot see it. He has a vision of the murdered Banquo sitting in his seat, and becomes hysterical talking to the vision. Lady Macbeth explains it to the nobles as an illness, and asks them to leave as Macbeth becomes more and more upset.