1. It's a hard spell to cast in a hurry. 2. There are things that keep the scaling from happening and if that happened, we've just given them a fantastic defense spell for free that will keep OUR spells from working on them. 3. THEY WOULD WANT TO KNOW WHERE WE LEARNED IT and I don't think we'd better say 'oh, Neville has these books that used to belong to his parents back when they were aurors instead of dangerous enemies of the Protectorate!'
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1. It's a hard spell to cast in a hurry.
2. There are things that keep the scaling from happening and if that happened, we've just given them a fantastic defense spell for free that will keep OUR spells from working on them.
3. THEY WOULD WANT TO KNOW WHERE WE LEARNED IT and I don't think we'd better say 'oh, Neville has these books that used to belong to his parents back when they were aurors instead of dangerous enemies of the Protectorate!'