A sand flood doesn’t damage anything but coats all paved or hard surfaces in a new thin hard layer of transparent glass as it passes. Small pets can be caught in it, with the glass forming a shell around them that the pets can jump through if quick, leaving behind the hollow glass shell attached to the street or surface. There have been occasional cases where a passed out person on the street has been caught in it and unable to move quickly enough to avoid being trapped. Those people are preserved in the state in which they were caught, appearing from a distance as if they are just passed out. Only on closer inspection is the glass shell visible.
Written by David Harris