After defeating Reynaldo (the weird squirmy thing), go to the fire to the left where the zombie eating the human was to get a Fire Orb. Before leaving to the castle, enhance the Fire Orb to level 2.To get a Bow in the castle, go to the place where the bucket is located and cut it. Go upstairs and there will be a trick crate. Open it to get the Bow. Make sure you have normal arrows before using the Bow. You can find 10 normal arrows when you barely enter the castle and see the samurai and the kid.