Banquo is in the royal palace thinking about the events that occured. He' thinking about how Macbeth is now king and worries that it didn't happen by chance.
You asked for us, Your Highness?
He frightens me greatly.
We must be rid of Banquo.
He then thinks of the weird sister's propphecy. If Macbeth's came true, then his should come true aswell.
Don't forget what he did to you both either. He ruined your lives, now we must get revenge. Are you with me? Are you MAN enough?
Macbeth and Lady Macbeth have been crowned king and queen. They are followed with his court to join Banquo. They ask if he will join their feast tonight, to which he agrees. The kings sons have fled and Macbeth and believes they are plotting to take away his crown.
Well, I don't really care about my life anymore, so why not?
Just make sure you kill him and his son, Fleance, please.
After Banquo leaves, Macbeth gets rid of his court and his servant brings the two murders he hired. He talks of how he is frighten of is friend Banquo and what he could do to him.
Macbeth uses the wrongs Banquo did to the two in the past in order to convince them to do his biding. He asks if they are man enough to go against Banquo and get revenge.
The two agree, saying that their lives are so troublesome that they're willing to put them on the line. Macbeth reminds them to kill Banquo and his son, Fleance, in order to derail the prophecy.