So I was reading through the rule book and on page 12 there is an example of Line of sight.
The 2nd instance they show says that Jain Fairwood does no have line of sight to the Zombie. However if you trace a line from the bottom left corner of Jain to the bottom right corner of the zombie it crosses the obstacles at the corners which would be in line of sight. In the Book it says in Bold that it's any corner to any corner. This makes the obstacles and line of sight virtually useless as so long as you aren't directly on the other side you can always see around. They don't even really block movement because you can move diagonally through them. Maybe it would have been better if you had to trace to the same corner.