Haunted Barracks

So I was in a room at the army barracks which is from the Victorian era. I was at the back of the classroom watching 2 instructors doing a test. I saw something white moving in the corner of my left eye and saw the 2 flags on the window sill fluttering. there was no draft coming through the window and any movement in the room wouldn’t have caused them to move. Interesting 🤔