This is a scene in chapter 1, when Ponyboy got jumped by Socs. "Need a haircut, greaser?" The medium sized blond pulled a knife out of his back pocket and flipped the blade open.
This is the time when Johnny and Ponyboy got jumped by Socs. They were drowning Ponyboy, and Johnny killed a Soc.
This scene is the time when Johnny and Ponyboy went to Dally to ask for help and directions.