Luca Hass detested unraveled hems. It was an irrational thing, she knew, born perhaps from years of trying to mend her own threadbare clothes with clumsy stitches that only ever seemed to fray further. The sight of a loose thread on a cuff, or worse, a torn seam on someone’s robes, made her skin crawl. It felt like an omen of unraveling, of things falling apart. Her fingers twitched, an automatic, almost painful urge to snip it clean.
Today, Professor Snape’s left cuff dangled a particularly egregious, three-inch length of black silk. It swayed hypnotically as he swept his wand, stirring the steaming cauldrons. The classroom air, usually thick with potion fumes and nervous whispers, was silent, save for the rhythmic clink of his glass stirrer against the cauldron’s rim. Students hunched over their bubbling concoctions, desperate to avoid eye contact. Luca, however, found her gaze snagging, again and again, on that defiant thread. It was unprofessional, sloppy, and she found herself thinking that even a perfectly brewed Potion of Wideye couldn’t make up for such sartorial negligence. Really, what did he do to his robes?
“Hass,” Snape’s voice, a low, silken rasp, cut through her reverie. “Your Scouring Charm is commendable, if somewhat… enthusiastic. However, you are brewing a Shrinking Solution, not a floor polish. Perhaps focus less on the shine of your workbench and more on the consistency of your Flobberworm Mucus.”
Luca flinched, pulling her gaze away from the offending thread as if caught with her hand in a cookie jar. Her cheeks warmed. She’d been scrubbing at a minute, almost invisible splatter on her pewter surface. “Apologies, Professor,” she murmured, grabbing the pestle. The Flobberworm mucus, a sludgy green, looked perfectly consistent to her, but she mashed it again for good measure. Snape merely sneered, turning his attention to Neville Longbottom’s shuddering cauldron, which promptly belched a cloud of foul-smelling, purple smoke.
Class ended with the usual frantic scramble, everyone eager to escape the stifling atmosphere. Luca, however, lingered. She had a question, a small, nagging detail from the Transfiguration lecture that morning. As the last student shuffled out, Hermione Granger pausing briefly at the door with a pointed look, Luca took a deep breath.
“Professor?”
Snape, who had been meticulously cleaning his own workbench with a flick of his wand, slowly straightened. The offending thread still dangled. “Yes, Hass? I trust your question is not about the optimum viscosity of pixie dust, as we covered that last week.”
Luca swallowed. “No, Professor. It’s about the vanishing spell, *Evanesco*. Professor McGonagall mentioned it works best on non-magical objects, but the textbook also lists its application for potions that have gone awry. That seems contradictory.”
Snape’s dark eyes narrowed. He looked at her, not at her face, but somewhere just over her left shoulder. “The textbook is correct. And Professor McGonagall is correct. The spell is more effective, less taxing on the caster, and less likely to cause a catastrophic magical feedback loop when used on mundane items. One *can* use it on a potion gone awry, but there are… risks. Are you contemplating a particularly reckless experiment, Hass?”
“No, Professor!” she quickly assured him. “I was just wondering about the fundamental magical principles.”
He regarded her for a long moment, then, with a sigh that seemed to carry the weight of centuries of student questions, he turned fully. “The magical signature of a failed potion is complex. It interacts with the existing enchantments of the ingredients, creating a resistance. To truly vanish such a thing requires a finer touch, a greater understanding of its composite magical energies. One does not simply *Evanesco* an entire cauldron of concentrated Polyjuice Potion, for instance. It would be… ill-advised.” He paused, and for a fleeting second, his gaze seemed to flicker down to her hands, which were idly tracing the pattern on her school bag. “Sometimes, Miss Hass, it is better to simply dispose of the evidence by conventional means.”
Luca nodded, a knot forming in her stomach. “I see. Thank you, Professor.” She thought about asking about the thread, but the words died in her throat. She gripped the strap of her bag tighter.
As she walked out, she spotted Hermione waiting in the corridor. “He kept you late,” Hermione observed, not a question. “What did you ask?”
“Just about *Evanesco*,” Luca replied, trying to sound nonchalant. “Why it’s harder to vanish a potion than, say, a quill.”
Hermione nodded, already processing the information. “Ah, yes, the interplay of magical signatures. Fascinating. Though I’d have thought you’d be more concerned with your own failing Mandrake Restorative Draught. It was quite green for a golden solution.” She gave Luca a sharp, knowing glance that made Luca feel utterly transparent. “Perhaps you should consult the supplementary texts in the Restricted Section. There are some excellent treatises on counter-charms and containment spells that might elucidate the finer points of magical dissipation.” With that, Hermione pivoted and marched off towards the library, leaving Luca feeling like she’d just been assigned extra homework.
Luca sighed. She hadn't actually *failed* the draught, just hadn't quite got the golden shimmer. It was serviceable. But Hermione was never satisfied with "serviceable."
As she walked down the stone corridors, the earlier conversation about vanishing things kept replaying in her mind. *Dispose of the evidence by conventional means.* Snape’s tone had been unusually pointed. It was just a theoretical question about a spell, yet he’d made it sound like she was planning a felony. Perhaps it was just Snape being Snape. Still, the way he had looked at her hands…
She rounded a corner and paused. A small, dark object lay glinting near a loose stone in the wall. It was a locket, tarnished and plain, with no visible engravings. It looked heavy, ancient. And oddly out of place. It didn't look like student property. What was it doing lying here in the middle of a deserted corridor? And why did her skin prickle with an unfamiliar coldness as she looked at it? She knelt down, her fingers hesitating inches above its cold, dark surface.