In chapter 2, what happened to Johnny .what made it so terrible

Steve noticed Johnny's jacket. It had a blood stain on it, and there were more stains across the grass; they then saw Johnny, "a dark motionless hump on the other side of the lot." Johnny had been beaten badly, and Ponyboy thought he might be dead. Two-bit, Darry, and Dally arrived, and Dally's reaction surprised Ponyboy: he "had seen people killed on the streets of New York's West Side. Why did he look sick now?" Johnny told them that he had been followed by a blue Mustang, and four Socs had jumped out and beaten him.