Romeo, shocked at what has happened, cries “O, I am fortune’s fool! The Prince enters, accompanied by many citizens, and the Montagues and Capulets.
Benvolio tells the Prince the story of the brawl, emphasizing Romeo’s attempt to keep the peace, but Lady Capulet, Tybalt’s aunt, cries that Benvolio is lying to protect the Montagues. Prince Escalus chooses instead to exile Romeo from Verona.
Shakespeare has done this to create tension between the two scenes, as the audience will expect a fight from this scene reflecting the first one.
The prince has to intervene in both but in the first he gives a warning 'your lives shall pay the forfeit of the peace'. Also to add to this the scenes are both set in public places, with both Benvolio and Tybalt included.
As they walk in the street under the boiling sun, Benvolio suggests to Mercutio that they go indoors, fearing that a brawl will be unavoidable should they encounter Capulet men. Tybalt turns his attention from Mercutio to Romeo, and calls Romeo a villain.
Mercutio replies that Benvolio has as quick a temper as any man in Italy, and should not criticize others for their short fuses. He approaches Benvolio and Mercutio and asks to speak with one of them. Romeo, now secretly married to Juliet and thus Tybalt’s kinsman, refuses to be angered by Tybalt’s verbal attack. Romeo protests that he has good reason to love Tybalt, and does not wish to fight him.
Mercutio’s response to his fate, however, is notable in the ways it diverges from Romeo’s response.
Romeo blames fate, or fortune, for what has happened to him. He seems to see people as the cause of his death, and gives no credit to any larger force.
As one who has displayed such traits, Romeo is banished from Verona.
Earlier, the Prince acted to repress the hatred of the Montagues and the Capulets in order to preserve public peace; now, still acting to avert outbreaks of violence, the Prince unwittingly acts to thwart the love of Romeo and Juliet.