At the appointed time, before Dumbledore could speak, Sirius was already shouting excitedly, "Let's go, let's go! Dumbledore, let's get moving. It's time!"
Harry had no doubt that if his godfather transformed into his Animagus form now, his tail would be wagging wildly.
Harry knew he should not think of his godfather like that, but he could not help himself.
Dumbledore smiled faintly, but his gaze settled on Harry. "Is everyone ready?"
Everyone nodded.
Dumbledore gave a slight gesture toward the fireplace, and orange flames immediately sprang up inside. "Just step through one at a time. I've already connected it to the other end."
That wasn't how Floo Powder was supposed to work, Harry thought, though he had no doubts about what Dumbledore said.
After all, Dumbledore could make a Portkey with a single spell. Being able to alter the way the Floo Network worked a little hardly seemed incomprehensible, did it?
Lupin was the first to step through the fireplace, disappearing without using any Floo Powder. Sirius immediately tried to follow, but Tonks beat him to it, leaving him to take third place in disgruntlement.
Harry, who was quicker on his feet, went through fourth.
Amid the flickering flames, Harry found himself inside another fireplace.
"Move along. There are plenty of people waiting." The urging came in rather imperfect English.
Harry hurried out and found himself in a very large room.
The room was empty, with two neat rows of fireplaces along the walls on either side. People kept emerging from them, while those standing nearby continually urged everyone to hurry up.
Harry soon spotted Lupin and the others who had come ahead of him. Surprisingly, all three were in completely separate parts of the room.
Apparently, all these fireplaces were interchangeable, and arrivals would emerge at random from