Will admired the place as he explored it. Compared with Dumbledore's Undetectable Extension Charm, what he had used in the High Tower was child's play.
The Training Ground occupied a secluded Tower in Hogwarts. Dumbledore had expanded a room into a vast lake. It might not have been as large as the Black Lake, but it was astonishing all the same.
The shore looked much like that of the Black Lake, with trees and broad stretches of aquatic plants.
Will's eyes shone. The Undetectable Extension Charm was incredible. He had to learn it. His desire to make a portable Library was growing stronger by the minute.
Professor McGonagall held a crystal ball, glancing into it now and then to check on Harry and Cedric. Occasionally, she sighed.
Then she looked at Will, who was gazing around the shore, and felt more pleased with him than ever. A student like Will—gifted, eager to learn, polite, powerful yet modest—was exactly the kind she liked.
If only the boy had come to Gryffindor, Professor McGonagall thought. Aloud, she asked, "How is the potion coming along?"
Professor McGonagall knew Will was Brewing Felix Felicis. That was hardly surprising; he had never intended to hide it from the professors. It simply didn't matter to him.
In the professors' eyes, Will was a Potions prodigy of the highest order. They all agreed he would make outstanding contributions to the field one day.
"Steady progress," Will replied, looking up. Then he immediately asked, "Professor, I still don't quite understand Professor Dumbledore's Undetectable Extension Charm..."
Professor McGonagall began explaining it to him on the spot. A few minutes later...
[You gained new spell knowledge. Charms experience +2]
Will was pleased to have picked up two experience points and learned more about the Undetectable Extension Charm. Just