After leaving the Hospital Wing, Harry spent the entire way back discussing Diggory with Hermione and Ron. No matter how you looked at it, Diggory running off to be hospitalized at Hogwarts reeked of weirdness. St. Mungo's Hospital for Magical Maladies and Injuries was clearly a better choice, yet Diggory had come to Hogwarts instead.
The three of them ultimately agreed that the main reason Diggory had come to Hogwarts to recuperate was simply that Hogwarts was safe. After all, someone had mysteriously vanished from St. Mungo's Hospital for Magical Maladies and Injuries not long ago, and there was still not the slightest clue about their whereabouts.
As for why Diggory had been injured, it remained a mystery, but all three of them believed his injury had something to do with You-Know-Who; otherwise, Diggory wouldn't have fled to Hogwarts to take refuge.
Chapter 1120