Wand allegiance.

[pippin_999]

No: HPFGUIDX 187360


> Carol again:
> But there's nothing to back him up, no evidence to indicate that his statement or his perception is accurate. And what has he asked of the wand that would require new powers?

Pippin:
I understand the aesthetic preference for showing over telling. But in this case it would give us an entirely different story, one in which Harry had concrete evidence, independent of Voldemort's perceptions, that the Elder Wand had not given Voldemort its allegiance.

I can understand  thinking it's a plot hole that Harry didn't get any proof, since Harry acts as confidently as if he had it. One might think that Harry was supposed to have it, and JKR forgot to tell us what it was. 

But what the story tells us, IMO, is that Harry had confidence in other things. He had faith in his ability to interpret Voldemort's perceptions and decide whether Voldemort was deluding himself or not. He had faith that Dumbledore was more correct than Voldemort about how the Elder Wand chooses its next master. And at bottom, Harry had faith that there must be a way for love to prevail over hatred and violence. 

 
Pippin