The Monsters of Millwood County

You toss the book and run. You run and run all the way home, your fight or flight instinct kicking in to keep you safe from whatever is happening here. Your parents will be mad you lost your backpack and the money for lunch, your neighbor will be furious you lost his dog, and whoever owned that bag will probably be enraged you lost his book, but those are all bridges to cross when you get to them.
You arrive home and lock all your doors. You hide in your bedroom. Your parents will be home in a few hours. You'll be safe here until then.