Chapter nine in 'The Outsiders' is that brutal rumble scene, right? Johnny's dead, and Darry says they have to show up for it or they'll be labeled cowards forever. Ponyboy goes in feeling sick and disconnected, like he's watching himself from far away. He doesn't even feel the punches properly; it's all just noise and heat. But the real gut-punch isn't the fight itself—it's what he says to Dallas after they technically win. Dally is ecstatic, hyped up on the violence, and Ponyboy just looks at him and says, "We're all messed up, aren't we?" Or something close to that. It's a quiet moment of despair in all the chaos. He realizes winning a street fight means absolutely nothing. It doesn't bring Johnny back, it doesn't fix his shattered home life, it doesn't change the system that pits Socs against Greasers. That resignation, that total loss of the fiery spirit he had at the start of the book, is what sets him on the path to the church fire. He's got nothing left to lose, so he follows Dally's reckless lead without a second thought. His fate shifts from a kid fighting for his turf to someone so numb he'll run into a burning building just to feel something.
It’s the first time he doesn’t romanticize the gang life. Earlier, even after Bob’s death, he saw a kind of noble purpose in being a Greaser. Post-rumble, that glamour is completely stripped away. The chapter ends with him more lost than ever, which is why the news about the church kids snaps him out of it—it gives his despair a direction, albeit a dangerous one.