When H&C drops the disguise, Hermoine recognizes him/her. I don’t think it is particularly likely that ghost-Voldemort looks anything like any picture of him from a history book. So how would Hermoine recognize him?
I feel that I should point out that when the black mist lifts and Hermione recognizes the face of her assailant we have no reason to believe that the face she recognizes is not itself an illusion.
Since we already know that she has been obsessing about Draco, I suspect that it may even have been his face (though with the information we readers have it is obvious that H&C is not actually he), though I don’t put a great weight on that suspicion.
When H&C drops the disguise, Hermoine recognizes him/her. I don’t think it is particularly likely that ghost-Voldemort looks anything like any picture of him from a history book. So how would Hermoine recognize him?
I feel that I should point out that when the black mist lifts and Hermione recognizes the face of her assailant we have no reason to believe that the face she recognizes is not itself an illusion.
Since we already know that she has been obsessing about Draco, I suspect that it may even have been his face (though with the information we readers have it is obvious that H&C is not actually he), though I don’t put a great weight on that suspicion.