So What/Speech Intention
This passage (III. i. 34-134) adds much heated conflict to the play. First of all, two deaths occurone of Mercutio, and one of @@Tybalt. While Mercutio dies, defeated through underhand trickery, he screams at both of the houses, blaming their conflict for his death. Mercutio, seeing Tybalt in the street, exchanges some verbal blows with him, and then they fight. Romeo makes an attempt to intervene, and while Mercutio is stunned, Tybalt stabs him under Romeos arm and flees. Mercutio delivers his Oh my god, Im dying speech, and is presently dragged offstage by Benvolio to see a doctor. Romeo then follows Mercutios speech with a Curses, this is all my fault speech, and ends it by stating how Juliets beauty has befouled his mind. Benvolio then returns and makes an official statement; Mercutio is dead. Then Tybalt returns, and Romeo, in his suppressed rage, challenges and kills him. So now, the Prince, who has directly pronounced the punishment for fighting in Verona as death, will be chasing Romeo as well. And there is no way he can lie his way out, because there were witnesses. This is worsened by the fact that he is part of the reason Mercutio is now a grave man(III. i. 95). So now, with one of his best friends and his worst enemies dead, Romeo is plunged deeper into the sky of chaos, his hands red with the slanderous blood of Tybalt. This fall will continue to chivvy Romeo to his grave.
Literary Elements
Extended Metaphor: Mercutio constantly refers to Tybalt as King of Cats (III. i. 75) or ratcatcher(III. i. 73). He does this because Tybalt is the name of a rather cunning cat in a story, and makes him a king because he is the most sly and cunning of all. This also holds true, because Tybalt stabs Mercutio while he is stunned by Romeos interference, and characterizes Tybalt as one who will take advantage of any opening no matter how dishonorable it may be.
Metaphor: When Tybalt says Mercutio is friends with Romeo, Mercutio responds by intentionally mistaking consort for concert, and begins calling himself a musician and brandishes his sword, calling it a fiddlestick. He asks Tybalt to dance, and in reality means that he wants to fight Tybalt. This characterizes Mercutio as also a hot-headed short-tempered person, but just not as sly as Tybalt.
Soliloquy: After Benvolio drags Mercutio offstage, Romeo announces his feelings for the current situation. He openly proclaims his fear of the entire situation, how his reputation stained / With Tybalts slander(III. i. 108-109), and how Juliets beauty has made him into a softer, more sensitive character.