What is the main event in Rumble Fish?

An action-packed novel, the most important scene comes as
the climax of S. E. Hinton's Rumble Fish. At the end of Chapter 10,
Rusty-James gives up the leadership of the gang to Smokey, who also takes Patty as well.
It is one of the few times that Rusty-James decides not to use his fists to decide
matters. When Rusty-James discovers that the Motorcycle Boy is at the pet store, he
rushes to meet him. In Chapter 11, the Motorcycle Boy explains that his favorite fish
are Siamese fighting fish--"rumble fish"--which will kill each other if put in the same
bowl. The boys leave when the store closes, but the two return later and break into the
store and steal the fish. The Motorcycle Boy also releases all of the animals in the
store, taking the fish with him intent upon releasing them into the river. They are met
by Officer Patterson, however, who shoots the Motorcycle Boy; the Motorcycle Boy, along
with the fish, die in the street. Rusty-James is arrested, and he then further injures
himself when he breaks out the police car's window.