After he finished eating, Ivan talked and laughed among his slytherin friends until the feast ended. As he got up to leave One-eye suddenly materialized to stop him.
One-eye was the ghost of an old hufflepuff owl who had been a student at Hogwarts nearly 100 years ago. Infamous for being devious and mean, One-eye loves to play pranks and bully students. It it also unknown how he lost his eye, and it is theorized by many students that it was his cause of death.
One-eye immediately tried to push Ivan back using some form of ghostly telekineis, frightning many of the first years. But after he saw his little trick hadn't worked, one-eye disappeared as quickly as he came.
"Don't worry about that students!" Ivan said cheerfully, "You'll get used to him, now first years follow me to the dormitory!"