If the Daily Prophet's frenzied publicity campaign counted as advertising, then what Harley had done on the train was a live demonstration.
On the train, Harley's voice and the warm silver light that had filled the carriages had left a deep impression on the young wizards.
The Dementors and Harley's Patronus had offered the starkest contrast imaginable: one brought darkness and fear, the other light and hope.
Then, just after the fear and despair had passed, Harley had followed Professor Lupin to check on her classmates and brought them free chocolate.
Though the chocolate had come from the trolley witch, the young wizards would only remember that Harley had placed it in their hands for free.
That was better than any advertisement, more effective than any publicity campaign.
No one knew who had started clapping, but soon the Great Hall erupted in applause, mingled with cheers.
The Weasley Twins seized their golden opportunity while Professor McGonagall was away. They tossed several Ribbon Firecrackers into the air and shouted:
"Gryffindor's Lion Queen has defeated the evil Monster! Let us welcome our king's victorious return!"
"Where our king's wand points, there our hearts follow!"
Even some of the Slytherins applauded Harley. After all, Dementors weren't like Aurors; they wouldn't spare Pure-blood wizards, either.
At the High Table, Professor Dumbledore watched the scene with a smile, then turned to Professor Lupin.
"Remus, how does it feel to be back at Hogwarts?"
"Things are wonderful at Hogwarts now," Professor Lupin said softly.
"It reminds me of my school days. Those were the happiest days of my life..."
Before Professor Lupin could finish, a sharp sneer sounded beside them.
Professor Snape made no effort to hide the hatred in his eyes. Yet he deliberately avoided looking directly at Professor Lupin, muttering to himself in a