If you haven’t caught the epic episode of Witches of East End, “Snake Eyes,” I have to warn you; you’re about to enter spoiler country. There have been many pivotal moments this season in Witches of East End, from the identity of the shape-shifter to some unsettling character deaths. “Snake Eyes,” however, takes the cake by elaborating on the series’ mythology; incorporating more plot points from the original source material (Melissa de la Cruz’s novels); and shedding light on Joanna’s vague past.