The Headmistress eyed the blank parchment and cast a revealing charm on it, only to still be staring at a bit of blank parchment. Her mough drew into a tight line.
"Miss Weasley, if this is your own foolishness - " But she trailed off at the allegation, her eyes widening for only a moment before her expression went carefully as blank as the parchment Ginny had laid on her desk. "What was Professor Snape, exactly?"