What major events happened in chapter 3 in the outsiders

As they approach the abandoned church, they see it is on fire, and a schoolbus full of kids is gathered around it. Driving up to the burning church, they see a school group gathered outside. Against Dallas’ urging, Ponyboy jumps out to get a closer look, and hears one of the teachers of the school group tell the other that some of the children are missing. Dallas yells for Ponyboy to come back to the car, and as one of the teachers sees Ponyboy start to go towards the burning church, he yells at him to stay back and not risk getting hurt, but Ponyboy runs into the church anyway. Encouraged by Ponyboy, Johnny runs after him.