In this scene Kerev (Macbeth) and Richard (Banquo) recieve their fate from the interns (Witches). This is where they are told that in Macbeth he would become thane of Cawdor and then king; in this case head resident and then chief. Also, Banquo was told that his sons would become king.
Final Set of Prophecies
This is the scene in which after the prophecies that Kerev (Macbeth) kills Bailey (Ducan) to become chief. This is relating to Duncans murder in Macbeth because this is the first murder that Macbeth commits.
Birnam Woods meet Dunsinane
Later on this is when Kerev ( Macbeth) hires murders to kill Richard ( Banquo) because he is scared of his child becoming chief due to his prophecy. The relation to Macbeth is that they both had hired murders, and he is afraid of Richards daughter Maggie (Fleance) would become the new chief.
Beheading of Kerev (Macbeth)
Here we come to Kerev's ( Macbeth) final set of prophecies. Here is told that any human naturally birthed could not kill him and he was told about when Birnam Wood shall meet Dunsinane. I am showing here a C-section in which Merideth ( Macduff) was not born naturally ultimatley leading to the death of Kerev ( Macbeth).
This shows when Birnam Woods comes to Dunsinane. The patients represent the army, the doctor is Macduff. It is showing that this is about to be the end of Macbeth and his rule.
This is the ultimate end of Kerev (Macbeth). Since Merideth ( Macduff ) was not born naturally she was able to kill him. Therefore the prophecy given by the interns ( Witches ) was true. The relation here is showing how in the end all of the prophecies received led to his death in the end.