He is your classmate

You are searching for an important book in the forbidden part of the library and he helped you to go there. He gets caught by a ghost so he runs away letting you search alone. When you're almost going away, you see him with the librarian and the ghost, you hide and you listen to them

The Librarian: so, Tomases, who were you with mh?

Ivan stays silent for a moment

Ivan: with nobody. I was alone

He didn't say about you, he saved you...but why?