'wichcraft: Craft a sandwich into a meal--and a meal into a sandwich

  Its just a LOT of silver light, except for the Dementor scene when Harry thinks it was his father.
  It forms different animals each time, which is quite not like the Patronus Charm to do
  Harry gets it down his first try, but he can't seem to get it the rest of the time
  Harry could only do it at the end, when the Dementors were surrounding him