Hermione didn't notice Tom's snake coming from behind and it soon knocked the wand from Hermione's hand and Voldemort began his killing curse. The green light sprung from his wand straight for Hermione and she closed her eyes waiting on it hitting, but once she opened her eyes, she seen the gleam of a shield placed in front of her, one apparently strong enough to cause a rebound right back to Voldemort who's body slowly turned to Ash.