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Macbeth responded to Lennox by pretending to be shocked and devastated by King Duncan's death. He feigned innocence and grief, trying to mask his guilt and involvement in the murder. Macbeth also tried to divert suspicion away from himself by acting as though he was as horrified as everyone else by the king's death.
She berates the servant who brought the news. "Thou'rt mad to say it." Then she gloats. "The raven himself is hoarse who croaks the fatal entrance of Duncan under my battlements."
There is a disturbance going on during that night. Lennox is describing how there is a screaming of death going on.
The preceding scene with the porter contains many references to hell and its inhabitants.
He claims he did so out of anger over Duncan's death, but it is really to prevent them from telling the truth.
Cassius does not respond to the death of Brutus as Cassius dies before Brutus does. Brutus responds to Cassius' death with tender words.
Tension -Apex
she gets the guards drunk so that they pass out allowing Macbeth to kill duncan.
Lady Macbeth planned to blame the murder on the grooms of Duncan's chamber. This frame-up was successful, at least at first.
Lord death
He blinds himself with Jocasta's brooch.
They go into a thing called death,
They go into a thing called death,