See, what actually happens is that Harry is about to pull the sword out of the stone when Voldemort bites his finger off and takes the sword. He's about to slice open Charles Wallace when Uncle Merry Lyon, Fllewdur Fflam, and the big talking lion show up and shove Voldemort into the Crack of Doom, thus saving Munchkinland.

I hope I didn't give too much away.