Black Wolf

I have a question about the adventure. It says that the rattling wind acts during full black moon on each Clayday on page 5, but for me this isn't making sense. On page 8 it says: "As the night falls, the adventurers spot the full moon through the clearing clouds" and "The flames shed some small patches of insufficient light here and there whilst leaving other areas lit only by the moon." In the cover the moon is full red... So does the black moon emits light? Shouldn't the attack be each Wildday, since full red moon happens this day on Dragon Pass?