Demonstration

After the Cornish Pixie incident, Lockhart started reenacting his old triumphs from his books. Poor Harry was his helper. This is during an encounter with a werewolf: "Nice loud howl, Harry -- exactly -- and then, if you'll believe it, I pounced -- like this -- slammed him to the floor -- thus -- with one hand I managed to hold him down -- with my other, I put my wand to his throat -- I then screwed up my remaining strength and performed the immensely complex Homorphus Charm..."

( Also uploaded at [link] )