I am DMing a game where the PCs will be attacking drows and a question about light blindness and the daylight spell came up. One of the PCs is a witch with a hand as a familiar and cast daylight on the hand to blind the drow automatons. The question is if the witch covers the hand so the daylight stops and then uncovers the hand will those with light blindness be blinded every time or just the first time and stay dazzled every other round?