A player asked me if he could launch light enough things with his Wind Blast (Wind domain Power). I looked it over and saw no reason not to. The next game his character had a bag of powdered glass. He emptied it in front of him as a swift action and Wind Blasted it as a standard action...right into an orc's face. For that game I said the powdered glass would inflict some slashing damage to the first creature in the line. I was thinking, should I make it blind for a round instead with a fort save, inflict some bleed, or keep it with the slashing damage. Also how much damage should it do?