Harry Potter had went to the Chamber Of Secrets to fight Voldemort and save Ginny. He fought the basilisk and killed it, but it had bitten him

You were just outside the entry as he had asked you to stay there and come to help him if he yelled

Harry then yelled help!. When you walked into the moist watery Chamber you saw a handsome 16 year old boy. It was Voldemort as 16 who had been preserved as a memory in his diary.

Tom stood over Harry and Ginny as they laid on the moist ground