She looked down at the Dark Mark that was visible below his rolled sleeves. When Healer Netty had been in early and discussed their progress, it made Hermione think. Draco said his Patronus had rendered Crespo unconscious. A Patronus was needed for the Inferi potion. What if a Patronus wasn’t just a way to get rid of Dementors? What if they’d been wrong all these years? What if it was something more?