Easy lesson...maybe.
Emiliano was just confused about the non-being thing...as if talking about Physics in Muggle Schools. So, he took a mouse...awwee...
It was the pet he had always wanted, and finally he was able to play with it, at least for a while...mwhahaha...not!!
He practiced a few times more the enchantment...then the flick of the wand without the spell, then..."Evanesco!" He finally said, enchanted if it can be called that way...towards the poor mouse. Ouch...I'll se you later, I believe? He thought...then he looked at his desk. Nothing was left of that creature.

He sighed, then looked around...people were getting eweee, yucky snails. Time for vengeance, we believe....Emiliano never had good experiences with dirt animals.