Romeo tried to make peace with Tyablt, and intervened as Tybalt and Mercutio bagen fighting. Tybalt stabbed Mercutio under the arm of Romeo. Tybalt left. Romeo became angry from the loss of a close friend, and so, when Tybalt returned, Romeo killed him. I speak the truth.
He's a friend of the Montague's, he's lying!
Don't kill my boy... he avenged his good friend!
Indeed. For his actions, he will be banished. He can never return to this town again.