The rules say to target a concealed character, one needs an idea or guess where to aim. If a character with the Concealment power for visible light (and/or other ranged accurate senses) moves after firing a ranged attack or using move-by-action, then the position of the attack is known but the character may be some distance away from there at the end of his or her turn. If the character doesn't also have concealment from normal sound (and/or other ranged inaccurate senses) then one might handle this as a stealth versus perception contest, but otherwise the enemy has no sense to use. Guessing seems like it might be an insight versus stealth or insight versus insight contest. So the character might roll stealth and the enemy both perception and insight against it if he or she has an inaccurate sense to use or just insight if not, or the character might roll stealth and insight and the enemy perception and insight against them. I also wonder if hide in plain sight is needed. Obviously, the character is not in plain sight, but the advantage seems to involve a skill beyond normal stealth which might be needed here. How do people handle this?