and the Dark Lord will mark him as his equal ... one of those Horcruxes resides within him after Voldemort's attack when he was a baby. Harry picks up one of the three Deathly Hallows ...

By attacking baby Harry, he caused the prophecy ... and the idea that he was "mark(ed) as [Voldemort's] equal" led several of the Dark Lord's followers to believe (and hope) he'd be equally ...