Can we see the paragraph please? If I could see it I could give you the right one!
After benvolio explains what happened, last capulet demands Romeo to be killed. But lord Montague argues that tybalt got what was comming to him for killing mercutio. The prince comes up with a solution : because tybalt started the fight, he'll spare romeos life. But he rules that Romeo must be vanished from Verona.
The theme explored mostly is that there is no escape from our destinies and that we should embrace them without fear.