To cast "'consensus' magic"—or rather, "'consensus' magic" constructed with the Mirage Charm—it would be best, according to the "similarity" principle of Sympathetic Magic, to use a spell as well.
If he wanted to see the sky from the bottom of the lake... how would "'consensus' magic" make that appear?
Wizet looked upward, considering which spell he should use to pry open the possibilities of "'consensus' magic."
He quickly found an answer. He had mastered this spell long ago, and its effect was quite straightforward: it could open a hunchbacked One-Eyed Witch Statue.
Inside the hunchbacked One-Eyed Witch Statue was a secret passage that led to Hogsmeade Village.
He had learned this spell precisely because he had wanted to find a way out of Hogwarts and enter the Hog's Head Inn in Hogsmeade Village, where he could receive Aberforth Dumbledore's instruction.
The spell did not even have an official name, only an incantation—Dissendium.
Wizet wanted to try more possibilities with "'consensus' magic," so he simply cast Dissendium silently.
Dissendium!
A vague sensation guided him to raise his wand, slowly point it toward the lake's surface, then gently and calmly sweep it to one side...
When the underwater creatures rushed toward Wizet, Ludo Bagman had unexpectedly failed to notice right away. He considered it a commentator's dereliction of duty.
To prevent anything similar from happening again, he kept the screen focused on Wizet. His eyes were wide as he tried his hardest to follow Wizet's every movement.
He had a faint feeling that he was about to witness something extraordinary.
Ludo Bagman saw Wizet raise his wand. "Lovegood has raised his wand. It looks like he's about to do something!"
"Lovegood seems to be raising his wand over his head! What spell is Lovegood planning to cast?"
"Barty, do you know