This is one of the very first scenes we see, Ponyboy being jumped by SOC'S. This is when it is presented to the reader that soc's and greasers are bitter enemies. the top left corner is Ponyboy buying drinks with Cherry. this is when Pony starts to notice that Soc's and Greasers have tough times too. this impacts Pony because he begins to understand that Soc's don't always have it made.
Ponyboy has just been slapped by Darry because he was angry that he missed curfew. Darry tries to take it back but Ponyboy runs away in fear with Jhonny with the intention to start new lives. while running away they get jumped by drunk Soc's because they talked to their girls at the movie theater. in self defense Jhonny stabs one to save Ponyboy. this shows us and Pony that Jhonny will risk himself to save a friend.
Pony is trying to convince himself that Jhonny and dally are not dead, this causes him great unease and anxiety in himself. one of his friends comes over to see if he is ok, but when he asks how he's handling His friend's deaths Ponyboy keeps stating "He's not dead. I killed the Soc. He's sick." over and over again. this doesn't work because He knows that they died. out of his grief, he writes a story, and it's called 'The Outsiders'.