Dumbledore, who had been studying how to juice a Golden Apple, nearly smashed it into Lupin's face when he heard the explosion.
But the outcome was about the same. Juicing the Golden Apple and feeding it to Lupin was meant to wake him up; the explosion had scared Lupin awake, which also woke him up.
Wrong method, right result.
Dumbledore and Lupin exchanged a glance. The latter asked, "What happened?"
"I could tell who did this just by using the bridge of my nose." The former silently took a bite of the apple and helplessly left the Headmaster's Office. Lupin quickly followed.
The two arrived at the Alchemy professor's office on the south side of the third floor. After opening the door and entering, they felt as though they had stepped into an enormous plaza.
Judging by the office's size alone, it was probably no smaller than the Black Lake.
Dumbledore was momentarily overwhelmed. He quickly Apparated out of the castle, took a look from outside, and slowly let out a breath of relief.
Kayson had not gone insane enough to add a massive protrusion to the south side of the third floor of Hogwarts Castle. Instead, he had painstakingly extended everything from the foundations to the first floor, second floor, third floor, fourth floor... Fourth floor?
In short, the castle looked as though it had been expanded. It still had black brick walls and matched Hogwarts's original style.
After Apparating back inside, they found that Kayson had left the first floor of the massive new area on the castle's south side empty.
The second floor, meanwhile, had been renovated into an enormous classroom. He had even hung up a sign reading Alchemy classroom in advance.
There was a staircase beside the podium, and climbing it led directly to the