The train had jolted to a stop.

Darkness pressed in at the windows, and a strange cold crept through the compartments like a fog. Harry’s breath curled visibly in the air. Then came the rattling—slow, dragging—and the unmistakable feeling of despair tightening like a fist around their chests.

A tall, cloaked figure stood in the doorway.

And then, just as quickly—

"Stay where you are."

The voice was calm but firm. Professor Lup in stood, wand already raised. A sudden, silvery light erupted from its tip, and the cloaked figure recoiled. The chill broke like shattered ice, and the creature retreated down the corridor.

Remus turned back to the compartment. His face was pale, and his eyes were scanning them carefully.

"Everyone alright?" he asked, his voice gentler now. "That was a Deme ntor. Nasty things. They… feed on happiness. On hope."

He reached into his cloak and pulled out a bar of chocolate, breaking off pieces and handing them around.

"Eat this. It helps. I promise."