Kavi was wondering if their professors were not trying to teach them something that they might need later. What with everything happening around them. It was food for thought, better than really thinking about the spell itself. "Well if you want I can be the one to write up the pros on it." Like there were man of them.
Kavi might be a halfblood but he had been raised like a muggle so he sympathized more with people like Alice and less with the purests. "I mean, think of a way that this could be used in say a duel with a deatheater." Not all spells were bad, they were only as evil as the caster.