Harry's wand and priori incantatum

[innermurk <innermurk@catlover.com>]

No: HPFGUIDX 51419

Hello.
I have a burning question, that probably can't be clearly answered, 
but might be speculated on.
During the fiasco at the Quidditch World Cup, Crouch Jr. steals 
Harry's wand and sends out the dark mark. When the ministry wizards 
come and preform priori incantatum on the wand the shadow dark mark 
comes out proving it was his wand that preformed the spell.
My question is:
If during the end of GF during the duel between Voldemort and Harry, 
Voldemort had been stronger and forced the priori incanatum on 
Harry's wand, would we have seen that shadow again? Or perhaps since 
it had already been expelled, it was deleted from the wand?
If the spells were deleted, it might explain why some of the spells 
Voldemort preformed (AK on Harry for example) didn't come back out of 
his wand. Perhaps, whomever had the wand did Priori Incantatum to 
make sure it was Voldemorts wand and the spell came out then and was 
deleted from the wand.
Or perhaps it did come out, but in a way that was unnoticable. After 
all the crucios were only heard as screams, and the we don't know 
what actually happened with the spell, so perhaps something did come 
out, even a silence, which we didn't notice.
Just a few thoughts.
Discuss?

Julie