In the scene just prior to the porter's, the audience witnesses the reaction of the Macbeths to Duncan's murder , and it is a verytense scene. Macbeth is in a panic, thinking he'll never have clean hands again, and Lady Macbeth is chastising him for bringing the daggers from the room and calling him a coward for being unable to go back or pull himself together. They hear the knocking at the door even...
