So in my True Lone Wolf playthrough (where I only use a single Lone Wolf Source Hunter while the other one is dead) I have noticed that occasionally enemy Archers know exactly where to shoot their arrows, even though there is a great big Smoke cloud obscuring their vision of me (no Line of Sight) and I have hidden under a rock and moved (Sneak).
Needless to say, my Source Hunter doesn't last long after the arrow uncovers his Sneak. Does anyone know how the game determines whether the enemy can see where I am or not?