[Upon hearing that information, he only stares back at her in disbelief.]

There have been rumors and whisperings of such a thing, but that's all they were. Unconfirmed myths. Are you seriously telling me that Celestia itself has chosen us few Vision wielders to ascend?

[He has no reason to disbelieve her. And though he questions her now, his expression shows that he isn't discounting her information.]

Then explain why the death of one such as myself seems to bear no significance? Unless you're saying one's death leads to ascension.

[He's making a lot of assumptions here okay]