C1457 From the Night of Curse(14)

"Barrier?" What was this enchantment? Hearing the other party's words, the Canine Boy turned to ask.

"The barrier that forms the shell of the Spirit Body." "That mage was none other than Professor Snape, whom Husky and the others had met before.

The black-robed mage glanced at Husky and explained unwillingly: "Spirit Body s are a bunch of photons, they have no fixed shape