Actually, I am trans-fluent in sign language. Having 4 hands makes me almost impossible to drown out in a conversation!
If I had two heads I could do the same with audible speech.
Of course, now that I offered you mispronunciation as an explanation…and you wrote this really nice long post…I have to be a little bit demonic.
They were all on the Astral Plane when Tom “said his name” turns out there is no air on the Astral Plane (or not much) and no physical body to move air to make sound. Everything is a form of mental/spiritual communications.
So whether you THINK you are speaking English or Clickese it’s not sound based. I believe the spells the wizards use, have some sort of brain wave translator built into them…but really not sure.