I find it confusing with how range seems to be interpreted differently than line of sight for horror check.
Imagine two tiles; one is a hallway and the other is a room. (Both tiles are clear of obstacles or locks)
There's an investigator in the hallway and there is a monster in the room. They are one space apart - and also of course in separate rooms.
The investigator is allowed to fire his/her ranged weapon to hit the monster. (right?)
But the investigator never has to perform a horror check since they are in different rooms. (right?) Isn't that weird?