there WAS a language of magic, and various ancient languages are a corruption of it
This would be particularly amusing in the Potterverse for the implication that the bad Latin grammar in the spell incantations is actually right, and the thing we think of as 'correct Latin' is the wrong, corrupted, half-arsed version!
(And, just as when I half-remember a tune my brain will make up a plausible version of the missing parts that then turns out not to match the original, the Romans constructed a basically consistent grammar around their corrupted bits and pieces of spell-speech, it just wasn't the same as the one they were trying to recall.)
This would be particularly amusing in the Potterverse for the implication that the bad Latin grammar in the spell incantations is actually right, and the thing we think of as 'correct Latin' is the wrong, corrupted, half-arsed version!
(And, just as when I half-remember a tune my brain will make up a plausible version of the missing parts that then turns out not to match the original, the Romans constructed a basically consistent grammar around their corrupted bits and pieces of spell-speech, it just wasn't the same as the one they were trying to recall.)