"Dobby wants to save Harry Potter's life! Better sent home, grievously injured, than remain here sir!" --Dobby (CS10)
Late at night in the Hospital Wing, Harry awakes to find that his brow is being sponged by Dobby. An emotional Dobby laments that Harry has returned to Hogwarts and accidentally reveals that he was responsible for both the closed gateway at King’s Cross and the rogue bludger. Dobby also confirms the existence of the Chamber of Secrets and praises Harry’s goodness before disappearing (CS10).