After weighing it over repeatedly, Snape decided to tell Dumbledore that Narcissa intended to infiltrate Hogwarts and steal Felix Felicis. Since the old man was willing to lend Draco a hand, he could certainly handle this matter as well. Snape also did not want Narcissa's actions to cause trouble for Dumbledore's plans.
Although Snape had never used Felix Felicis himself, as a potioneer, he knew very well how extraordinary the potion was. If Draco used Felix Felicis, he might truly be able to repair the damaged Vanishing Cabinet ahead of schedule.
Once the Vanishing Cabinet was completely repaired, the plan to invade Hogwarts would be brought forward and become uncontrollable. It would very likely disrupt Dumbledore's original plans, and that was hardly good news.
"Your information came at a very timely moment, Severus."
After learning from Snape that Bellatrix had obtained Felix Felicis and that Narcissa intended to invade Hogwarts, Dumbledore's reaction was calmer than Snape had expected, as though it were merely a trivial matter.
"Narcissa didn't tell me the exact time, and..." Snape paused, raising his head to look at Dumbledore. "How do you intend to handle this?"
"There are only a few ways to sneak silently into Hogwarts. With Aurors patrolling, the odds of her succeeding are not high."
Dumbledore seemed to be considering something else. After a brief silence, the old man suddenly murmured, "This is actually a rather good opportunity."
"What good opportunity?"
A momentary look of astonishment appeared on Snape's face. He suspected Dumbledore was talking nonsense.
"It would be even better if you could find out when Narcissa plans to infiltrate Hogwarts. I hope every unexpected development remains within a controllable range."
Dumbledore recalled Albert's warning. He knew that his earlier arrangements might no longer be keeping pace with the changing situation, and