The post explains this: they don't. Standing water exhibits the same behavior as reflectiveless flat surfaces. When they fly over a space and "see" nothing be

The post explains this: they don't. Standing water exhibits the same behavior as reflectiveless flat surfaces. When they fly over a space and "see" nothing beneath them, they interpret this emptiness as a flat, smooth body of water. Thus the only real problem here is that for flat horizontal surfaces that aren't water, the bats will try to drink from them.