Ponyboy & Johnny were heading to the park because they were running away but suddenly were struck by attention to a blue mustang
Bob, drunk, came up to Ponyboy and started to drown him. Even though Johnny had been beaten, he knew the right thing was to save Ponyboy. So the only thing he could do is stab Bob, and he did.
In this scene, Johnny and Ponyboy are running away from the cops because they didn't want to get caught because Johnny had been wanted for killing Bob
Johnny and Ponyboy needed to seek shelter because they weren't just going to stay outside living on the streets knowing they can easily get caught.
Because Johnny or Ponyboy had left behind a cigarette behind once they had the left the Church, the church ended up burning up on fire. Unfortunately, kids from the picnic near the church, went inside the Church.
Because the jacket Darry had given Ponyboy caught on fire, Ponyboy had passed out and was taken to the Hospital. in this scene, Ponyboy had also realized that Darry had acted the way he'd acted because he was afraid of losing more loved ones