The setup for Story 2 contains adjacent rooms with no wall or door. The rules say that you must roll for horror when entering a room with a monster or when a monster enters the room. My assumption is that applies in the case where there is a clear line of site since the rules specify "room".
However, I just wanted to know if anyone could verify that even if there is a line of site between 2 rooms, you only do the horror role when in the same room as a monster.