"You are so out of your mind that you believe anything that's in the Quibbler," Draco said to Luna.
Despite the insults being hurled at her, Luna remained completely calm. She was even sort of smiling, like Draco's words weren't having any effect whatsoever.
However, even she then became stunned when all of a sudden, Draco slapped her hard across the face, making her stumble. As he did so though, he was caught doing it by Harry. And Harry was furious.
Without even bothering to call out to him, Harry pulled out his wand.
"Rictusempra!" Harry cried, blasting Draco off.