The Kill Zone ability says "Take a reaction shot against any enemy that moves or attacks within cone of fire" and the Guardian ability says "With every successful Overwatch shot, there is a 50% chance that another shot will be taken."
If Kill Zone does stack with Guardian, the descriptions lead me to believe that a Kill Zone/Guardian special could potentially deal a lot of damage to a whole pod of enemies.
Do these perks stack?
Best Answer
Yea you should get them to stack. Reaction shots are synonymous with overwatch shots.