Trina looked up, glancing Rika over.  "Hold on, Aunt Hitomi," she said, walking over and yanking the robes off carefully, so as not to rip them.  Then she pointed her wand at the other prefect, starting at her hair, and uttered a simple spell.  "<em>Aquamenti!</em>"  A jet of water splashed out of her wand, dousing the girl in cold, clear water, washing away most of the vestiges of what she had been through.  "Now bear in mind," she hissed, her voice sharp, belying the fact that she was in Ravenclaw.  "If you attempt to utter so much as one word of what has happened here, we WILL know.  And this will be NOTHING compared to the punishment you will receive when we get a hold of you!"