Defeating Voldemort

[Jamie]

No: HPFGUIDX 30416

"If their wands are brothers, as we have seen in GoF, and they cannot 
be used against each other, is it expected that Harry will get a shot 
in before Voldemort can defend himself?"

My impression of the whole "brother-wand" phenomeon is that the two 
wands locking only happens when the two spells collide.  So unless 
they end up casting spells at the exact same time, I don't think the 
wand issue would be a problem - but this is but my humble opinion.