From RTL:

Shadowy Copse: Deep Shadows -Figures cannot trace line of sight further than 3 spaces away.

Soar: (shortened): Any figure with Soar is considered to be flying above the ground, and the range both to and from it is increased by four spaces.

Last game we had a conflict regarding these two combos. OL figured he could hold a razorwing out of reach by not swooping down on the heroes. Heroes managed to clear all other monsters, but since the razorwing didnt swoop down they couldnt end the outdoor encounter, apart from fleeing(heroes didnt have blast/breathweapons). The entire event resulted in a heated debate where heroes didnt want to give in, all just guarding around the razorwing, while the OL kept his stance. 

Blood has been spilt, bones have been broken, teeth have been lost, and we figure we all need to look for a solution on the O mighty forum. Does anyone have a solution to our problem? Or is it just plain simple: this is a battle the OL cant lose if he just doesnt swoop down?

In the start of the event the OL suggested to let the razorwing be "out of reach" untill all other monsters were dead, but it seemed strange and the suggestion was voted down.

Sorry for the blood and the bones, that wouldn´t have been necessary:

Tracing LoS and counting range for attacks are not identical. The OL couldn´t have kept the Razworwings out of reach. As soon as a hero is within three spaces, he can attack them using ranged weapons, with the range needed being the number of spaces to the target (max. 3 in this case) + 4.