The murderers go to Macbeth’s castle and inform him that they killed Banquo, however they did not kill Fleance. Macbeth then says that Fleance is fearless to him but there will be a time where he will need to kill him.

MACBETH

Then comes my fit again. I had else been perfect,
Whole as the marble, founded as the rock,
As broad and general as the casing air.
But now I am cabined, cribbed, confined, bound in
To saucy doubts and fears.—But Banquo’s safe?
FIRST MURDERER

Ay, my good lord. Safe in a ditch he bides,
With twenty trenchèd gashes on his head,
The least a death to nature.
MACBETH

     Thanks for that.
There the grown serpent lies. The worm that’s fled
Hath nature that in time will venom breed;
No teeth for th’ present. Get thee gone. Tomorrow
We’ll hear ourselves again.

The Macbeth crowning party starts and Macbeth acted as if he is angry that Banquo did not come, pointing that he is being rude.

MACBETH

Here had we now our country’s honor roofed,
Were the graced person of our Banquo present,
Who may I rather challenge for unkindness
Than pity for mischance.
Macbeth than sees a ghost of Banquo and gets frustrated. Lady Macbeth then tells everyone to calm down and that Macbeth has been talking to ghosts since his youth.
LADY MACBETH

Sit, worthy friends. My lord is often thus
And hath been from his youth. Pray you, keep seat.
The fit is momentary; upon a thought
He will again be well. If much you note him,
You shall offend him and extend his passion.
Feed and regard him not. (aside to MACBETH) Are you a man?
And after the ghost left. Macbeth toasted Banquo and then the ghost came back. And Macbeth gets frustrated again. When Macbeth told him to leave and he left, Macbeth switched back to normal