That pesky wand-core thing SPOILERS!!!

[June Ewing]

> Phyllis:
> IMO, the laser show is nonsensical. At the point of Harry and
Voldy's final confrontation, Harry has Draco's wand and Voldy has
> the Elder Wand. So there are no common wand cores (since neither
have their original wands with Fawkes phoenix-feather cores) and
> therefore no priori incantatem (which results from wands with
> common wand cores being forced to do battle against one another).

> Since we don't hear the spells that they are casting, apparently
we're supposed to be able to determine that the fact that Voldy's
jet is green means that he's casting an avada kedavra curse while
> the fact that Harry's jet is red means he's casting expelliarmus.
However, this doesn't work for me. Also, how canVoldy's curse only
> rebound on him after Neville kills Nagini even though both green
> and red light jets have been locked together for what seems like
endless hours? IMO, it would have worked much better to have only
> one set of spells cast at the very end, as in the book.


June:
It could be, maybe that it was done that way because both wands
had belonged to Draco and Harry having won Draco's own wand from
him now owned the elder wand as well, so both of them really were
using wands that belonged to Harry. Just an idea.