I've played around with a few things and now I am getting just 1 archer shooting at me if multiple archers are on the play field with one with line of sight and one without line of sight. The problem is it only works for the first archer that is spawned. If the second archer has line of sight and the first doesn't the second archer just stands there.
Also I discovered that if multiple archers are on the playing field and the archer is destroyed it destroys all the archers line of sights so no one can shoot then until a new archer is spawned and then whatever archer on the playing field that was spawned first will fire if there is an archer with a good line of sight.
Here is an updated capx: lewispcservice.com/downloads/dragonrage2.capx