He was rather out of breath by the time he found everyone again. They were gathered at the head of the first car, staring hard at the door. Merlin looked up as James entered. His face was grim, but James thought he could sense some enjoyment in the big man's expression; the Headmaster was pleasuring in the hunt.
"We chased it here," Zane said, grinning. "It slipped right through the crack in the door, but the next car is the coal car. End of the line!"
"Miss Weasley," Merlin said, turning to her, "you will open the door on my mark. Mr. Deedle, your wand has rather unique properties, as you know. If the Borley manages to get past me, then you, and only you, may attempt to Stun it. Your spell will not halt it but will distract and attract it, giving me the time I need. I will place the Borley in a trance. Then, Mr. Potter, I will require the Darkbag."
Ralph gulped audibly, producing his huge wand.
"Got it," Rose said, a little breathlessly. James nodded understanding.
Albus stood back. "Last time, it was standing on the metal bit that holds the cars together," he explained. "So aim low."
"Thank you," Merlin nodded, smiling slightly.
Rose gripped the door handle and everyone took a deep breath. Merlin nodded at her and she pulled, jerking the door all the way open and letting in a push of warm, noisy air. James squinted in the barreling wind and smoke, and then gasped, his stomach plummeting. Merlin slowly took a step back, spreading his arms to keep everyone behind him.
"I may not know what I'm talking about here," Zane said weakly, his eyes bulging, "but I'm pretty sure those aren't Borleys."
In fact, the Borley was exactly where they'd expected it to be. It danced on the huge iron knuckle that connected the train to the coal car, teasing them. Over it, however, darkening the air all around the coal car, swarming like a malignant living cloud, were dozens—perhaps hundreds—of Dementors.
"It's the entire hive!" James called over the sound of the clacking wheels and rushing wind. "All the way from London! Why are they here?"
Merlin didn't take his eyes from the horrible swarm. "I think," he said slowly, "the answer to that question is all too clear."
Rose looked from Merlin to the open, howling doorway. "The Gatekeeper is up there," she said, nodding toward the engine, which was just visible over the length of the coal car and the swarming Dementors.
Suddenly, the train's whistle blew, shrieking a long, deafening note. Rose clapped her hands to her ears and winced. Simultaneously, the engine seemed to lurch forward, picking up speed. James stumbled as the train rounded a turn, rushing through it at dangerously high speed.
"Look!" Zane called, gripping the open doorway and pointing. James peered aside, looking through the gap between the cars. Trees whipped past in a blur, and then something else flickered past: wooden signs and piles of gravel and railroad ties.
"It's the new extension!" Zane yelled, his face very pale.
"The new what?" Rose cried, shaking her head.
"Didn't you read the sign?" he called, exasperated. "It's the new track extension over the Sparrowhawk Gorge! We're off the main track! We've been switched onto the new extension!"
"Don't tell me," Ralph yelled, slumping. "The extension's not finished yet, is it?"
"No! The bridge over the gorge is hardly half-done yet! It's not supposed to be completed until next year!"
Albus nodded seriously. "This is bad. Very bad."
Merlin stepped forward, his face determined and his staff held before him. The wind whipped his robes and streamed through his hair and beard. Instantly, the cloud of Dementors condensed, collapsing onto the doorway and blocking it. The students stumbled backwards, terrified and falling over each other. The Dementors hissed and roared, and James felt his blood chill at the sound of it. He'd never known Dementors could speak.
The boyyy…, they hissed in unison, and their voices were horrid, buzzing like hornet wings. James Sirius Potter… the boyyy mussst commme…
Merlin had not stepped back in the face of the angry swarm. Now, however, he turned slightly, looking back at James over his shoulder. His face was cold, his eyes like diamond chips.
"It would appear you are being summoned," he said, his voice carrying easily over the noise and wind.
"No!" James cried. "I don't want anything to do with that thing!"
"The Gatekeeper believes differently," Merlin replied. "And it is going to kill everyone on this train if you do not meet its summons."
James shook his head adamantly. "I can't face that thing alone!" he exclaimed, terrified.
"You will not be alone," Merlin answered, smiling humorlessly. "I will be accompanying you."
James looked into the sorcerer's face. What he saw there was complete confidence and determination. The Dementors may try to stop Merlin, but they would not succeed. James nodded slowly and stood up.
As he stepped tentatively toward the open doorway, the cloud of Dementors backed away, allowing him room. They swarmed feverishly, and the sight of them made James shiver.
"Don't!" Rose called, grabbing James' sleeve. "There's got to be another way! You don't have to do it, James!"
James shook his head. "I think I do, Rose. It'll be all right."
"No!" she cried. "You're daft! You can't defeat something like that!"
James shrugged. "I have to try at least."
Zane put his hand on Rose's shoulder and Albus reached for her hand.
"Don't do anything stupid, big brother!" Albus called.