Will you pluck your sword out of his pilcher by the ears? Make haste, last mine be about your ears ere it be out.
I be for you. (III. i.81-84).
Romeo vs Tybalt
...for Mercutio's soul Is but a little way above our heads, Staying for thine to keep him company. Either thou or I, or both, must go with him.
Thou wretched boy that didst consort him here Shalt with him hence. (III.i.131-136).
Tybalt wants to kill Romeo. Romeo doesn't want to fight Tybalt because he is now related to him. Mercutio is disgusted by this and fights Tybalt himslef. He is stabbed, and dies.
Tybalt is gone and Romeo banished. Romeo that killed him- he is banished...
Romeo is furious at Tybalt for killing Mercutio. He decides to avenge his friend’s death. Tybalt and Romeo fight, and Tybalt is killed.
Benvolio explains what happened to the Prince, who decides that Romeo must be banished fro killing Tybalt, but not killed because he was only avenging his friend’s death.
Let Romeo hence in haste, Else, when he is found, that hour is his last. Bear hence this body and attend our will. Mercy but murders, pardoning those that kill. (III.204-207).
The Nurse tells Juliet about what happened with Tybalt and Romeo. Juliet cannot believe that her husband killed her cousin, but then she is even more upset because she realises she will never see Romeo again becuase he was banished. She has the nurse deliver a message to Romeo in the friar’s cell.
O, that deceit should dwell in such a gorgeous palace...Shall I speak ill of him that is my husband..."Romeo is banished." To speak that word Is father, mother, Tybalt, Romeo, Juliet, All slain, all dead. (III.ii.75-76, 90-91, 106, 133-135).
Friar Laurence tries to convince that being banished is the best thing he could wish before because they will be able to work out a way for him and Juliet to be together. However, Romeo is sure that banishment is a fate worse than death, and he is utterly distraught.
There is no world without Verona walls But purgatory, torture, hell itself. Hence "banished" is "banished from the world," And world's exile is death. (III.iii.18-21).