Because Adi liked Professor Morgan so much (though he still had misgivings about the subject she taught), he decided to help her keep the Room of Serenity comfortable. How would he do that? By using that spell Professor taught them, of course. It would help keep the room warm.

Adi stepped into the room. No one else was there. Good. He'd just do what he had to do and get out. He approached the nearest wall. "Caelum Saepio!'' As he said this, Adi moved his wand in the shape of the infinity sign. "Caelum Saepio!'' Wand movement again. He repeated this process a couple more times and soon the room had a bit of fog especially around the wall area he was working on.

The Hufflepuff did the same for another wall. He hoped that would be enough for the moment. Whoever came in here next would at least not be so cold.