You would think that Harry, on hearing a mysterious voice, would mention something. Harry turned around expecting McGonagall, not expecting some random person. Harry heard McGonagall.
The author would also mention that the voice changed owners or sounded strange. It’s clever writing to drop clues in plain sight to the reader. It’s not clever writing for your story to omit sensory experiences that are immediately apparent to all the involved characters, but are not conveyed to the reader.
Seeing the look of horror on Harry Potter’s face, Fred Weasley thought faster than he ever had in his life. In a single motion he whipped out his wand, whispered “Silencio!” and then “Changemyvoiceio!” and finally “Ventriliquo!”
Every member of Hogwarts could actually be Dumbledore with polyjuice and a time turner. Remember we only know about the 6 hour limit from him (or people that could be him, or forged by him). There’s no reason it couldn’t be so, just like there’s no reason that the person Harry was having a conversation with couldn’t have changed out by a an invisible man with a ‘changemyvoiceio’ spell.
But it’s way more reasonable to assume that people are who they think they are, and that the person that starts a conversation is the same one that finishes it.
You would think that Harry, on hearing a mysterious voice, would mention something. Harry turned around expecting McGonagall, not expecting some random person. Harry heard McGonagall.
The author would also mention that the voice changed owners or sounded strange. It’s clever writing to drop clues in plain sight to the reader. It’s not clever writing for your story to omit sensory experiences that are immediately apparent to all the involved characters, but are not conveyed to the reader.
I would be very surprised if there were a grand total of 0 voice-changing charms in existence.
And besides, it’s a whisper. That’s probably significant in some way.
You’re multiplying hypothesises unnecessarily.
Every member of Hogwarts could actually be Dumbledore with polyjuice and a time turner. Remember we only know about the 6 hour limit from him (or people that could be him, or forged by him). There’s no reason it couldn’t be so, just like there’s no reason that the person Harry was having a conversation with couldn’t have changed out by a an invisible man with a ‘changemyvoiceio’ spell.
But it’s way more reasonable to assume that people are who they think they are, and that the person that starts a conversation is the same one that finishes it.
Suddenly, Dumbledore EVERYWHERE.