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.
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.