After being severely injured with a fractured bone in his arm, Harry was in a lot of pain. Despite having caught the snitch, he was attacked by a rogue bludger immediately after that, which caused the fracture. However, before he was considered to be taken to the hospital wing, Gilderoy Lockhart decided to showcase his 'abilities'. Sadly, instead of curing the fracture, he just made the bones in Harry's hands disappear. Madam Pomfrey was displeased with this careless choice of Professor Lockhart because it was a very painful process to regrow bones, and Harry had to stay in the hospital for the whole night.