Explain in detail Ponyboy's and Johnny's escape and the reasons/motivations behind it in The Outsiders. Thanks.

After Johnny and Ponyboy were attacked in the park by the
Socs, Johnny was forced to stab Bob Sheldon, who was trying to drown Pony. They knew
that no one would believe their story; the other Socs, they believed, would claim that
Johnny had killed Bob for no reason. So, they decided to leave town and hide out until
things had cooled off. They hunted down Dally, who was at Buck Merrill's house, and told
him what had happened. Dally, though worried, was proud of Johnny and Pony, and he had a
plan. Dally had already discovered a great hideout in case he was in a situation similar
to his friends': He told them to hop a freight train and take it to Windrixville, where
there was an abandoned church just outside of town. Before Johnny and Pony left, he gave
them some money and a pistol for protection. They followed his instuctions, and they hid
inside the church until Dally came to see them after nearly a week. By the time Dally
arrived, Johnny had decided to return and turn himself in and hope for the best. The
church fire, and the boys' heroic actions in saving the children trapped inside, made it
much easier for Ponyboy upon his return. For Johnny, the burns and injuries he received
proved to be fatal, but he died knowing he'd saved the innocent children
inside.