"Sensus vim extermina ." Hermione steadied the magic. With the painful memories inserted, she now had to extract. She willed the light from her wand into Ron’s head carefully. Mentally, she made a list of what she wanted to remove and then ordered the magic to go to work: the purple light flashed across his forehead and Hermione removed his observations about Malfoy from the conversation he had with Percy. He would remember the discussion, but he would blame himself. If he were to recall negative comments about Malfoy, he would attribute them to his own shortcomings; his anger over the break-up with her.