harry potter - Casting "Riddikulus" on a Dementor?

In Prisoner of Azkaban, Harry is prevented from casting "Riddikulus" by Professor Lupin's interception, hence making the boggart change its form.

If Lupin didn't intercept it and Harry did cast the spell, what would the end (humourous) result be?

My intial thoughts were that it would become a black blanket or some black quill ink falling to the floor.

Answer

It depends on what the caster pictured when casting the spell. The form the boggart takes when the riddikulus charm is used isn't dependent on the form the boggart is in, it depends on what the caster has determined to change it into.

If you remember, both the book and the movie have Lupin instructing the class to imagine what they fear most and imagine a way to make it funny.

With Neville, he even asked what Neville feared most and told him what to imagine before casting the spell.

That said, we have no idea what Harry would have pictured for a dementor. Lupin interfered before we could find out. :-P

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