It felt fairly anticlimactic. Harry and Hermione held the diadem down with sticking charms while Theo plunged the fang deep into the fragment of Voldemort's soul. It screeched and hissed, emitting smoke and splinters of silver. The fang remained intact but when Theo stepped back, the diadem was nothing more than a blackened husk, not unlike Crabbe Snr’s body that Hermione had carelessly tossed in the cabinet.