He was biting his lower lip. Hoping that the freezing spell would hit him but then the Astronomer blocked it like it was child’s play. He looked annoyed at first but then Kevin simply shrugged his shoulders when the Professor told him that he needed glasses.

“I do not, I was just demonstrating that one should never believe what their opponent is saying” he said with a grin before turning around to go to his seat. But not before sneakily and secretly pointing his wand towards the Astronomer again and swished it “Petrificus Totalus”

Then he walked further to his seat with a small grin.