In the Hospital Wing, Dumbledore stood in purple pajamas, his expression grave as he watched Madam Pomfrey examine Su Er on the bed.
He had never imagined that Su Er, who had only just made plans with him in the Headmaster's Office, would now be lying in bed in a state he had never encountered even in all his long years.
"There's nothing wrong with him. It isn't Dark Magic. He's perfectly healthy, but we must replenish his magic immediately," Madam Pomfrey said gravely.
"I don't know what happened. The magic in his body keeps disappearing, dissipating. At this rate, if this continues..."
"He'll die!"
Dumbledore looked at Snape. Snape nodded silently, then left the Hospital Wing without looking back.
Before long, he returned with several glass bottles in his hands.
"This is all I have, but I'll start brewing more immediately."
"Then hurry! At this rate, this little supply of magic-replenishing potion won't last more than a few days!" Before Dumbledore could speak, Madam Pomfrey urgently snatched the potions and poured them down Su Er's throat.
Snape dipped his chin without a word, turned, and left again.
Dumbledore focused on Su Er on the bed, drew the Elder Wand, and murmured an incantation no one could make out. A faint glow spread from its tip.
He closed his eyes, seemingly sensing something.
"This is... the Patronus Charm?" Moments later, Dumbledore opened his eyes, a look of astonishment crossing his face.
Meanwhile, in the Centaur camp in the heart of the Forbidden Forest, Lisi pushed open her door, walked to the still-burning bonfire, and looked up at the sky.
"Priestess." A Centaur on watch pressed one hand to his chest and bowed his head slightly.
Lisi nodded gently to him, then gazed at the stars and murmured to herself.
"Pluto's