100 word challenge

On a frightful Halloween night and after a good long session of trick or treating, Billy decides to head on home with his mother right beside him. He checks his bag and, as regular trick or treaters would do, he checks the candy for any sort of trick or hazard inside of them and to his surprise, this year he had no hazards in them... he thought. When he was a few meters from the house his bag explodes into a horrible smelling, possibly poisonous ball of smoke and as the smoke cleared he saw a shadowy figure beside him.