Sampson who is part of the Capulet party and Abraham who is of the Montague come into a quarrel and Sampson mocks Abraham by bitting his thumb at him. The two families have always been at each other's throats and at times like these their own servants will take out their hate on each other.
After meeting Juliet at the masarade he goes to her castle outside of her balcony and listens to her conversation with her maid about him and his feelings.
This scene is their marriage and the moment that they have been waiting to do fot the longest time/.
When Sampson did this Abraham took offense to this and started the fight that broke out. This brought out the characters Tybalt of the Capulet family and Benvolio from the Montague. It also brought out the prince who is the one who broke apart the fight.
He waits for her to finish with her conversation then listens to her speaking to herselfabout him again and her confessing her feeling she has for him. At which this point he comes out of hiding and they speak of their feeling for each other.