I thought of this for stealth also, you could create a 'hiding spots' complication against others, especially if you have the area effect sfx. It would work as a die to add to pools not only for adding to attack rolls but also an opposed defence. Though it'd probably be better to use an Asset, because it'd be the same mechanical effect without inadvertantly knocking out a character from a scene, as d12+ complication is the same as d12+ stress on someone. That wouldn't make sense just for someone hiding, unless it was a chase scene and the runner was rolling to escape their pursuers, then it'd make sense.