>I think there is more to it than the song of the Phoenix in Harry's
>head. In CoS Fawkes came to Harry's rescue and healed him with his
>tears from the venom of the basilisk. Keeping that in mind, Harry has
>a strong connection to Fawkes and I think this allowed him to be
>"stronger" than Voldemort and be able to force V.'s wand to
>regurgitate the spells.
>My other theory is that Harry is "pure" he only wants to defend
>himself 

I think also it has to do with the fact that the tail feathers came from Fawkes. Harry has a 'personal relationship' with Fawkes, so perhaps because of that fact, the spell worked in Harry's favour because of that. Even though the tail feathers themselves aren't attached to Fawkes at the time of Harry and V's encounter, perhaps that, and the fact that it's a fight between good and evil and the feathers came from a 'good' Phoenix, is at least one of the reasons. That's just my opinion though, of course.
~Echo
AIM: CagedByFreedom

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