Riot

What
 * Show John's hatred of soma and the Deltas' love of it
 * Show John's view of this society and it's faults
 * Show Helmholtz's tendency to agree with John's radical ideas
 * Show Bernard's indecision in regard to which side he is on
 * Describe how their society deals with crimes/riots (with tranquilizers, soma, and more conditioning)

Why
 * Contrast John, a man of the Reserves and uncivilized people, with the generic members of the World State
 * Show that John wants to expose these people to the truth that they have missed their whole lives
 * Show that Helmholtz is as much of an outsider as John is, as they both (literally) fight against the World State
 * Show that Bernard, although unhappy, is not completely against the World State or accepting of it - he is on the fence
 * Gives an example of how soma and conditioning is used to control the thoughts and opinions of the people

How
 * John preaches to the twins, about the absence of manhood and freedom, and tries to make a point by destroying the soma
 * By actually have them fight each other, the contrast between John and Deltas is highlighted
 * By having Helmholtz jump into the fight cheerfully, it shows that Helmholtz supports John's purpose for fighting
 * By having Bernard help neither side of the fight and stay on the side, it shows that he does not wholeheartedly support either side
 * Overall, the fight was used a metaphor for the conflict between those in favor of current society and those who are not
 * By comparing the fighters before and after the "police" come, it shows how their conditioning completely changed their ideas and reduced their passion