After last week’s amazing episode, “Necromancer,” my hopes were high for another thrilling installment of Sleepy Hollow but unfortunately, “Sanctuary” isn’t quite on par. That doesn’t mean it’s not without its own surprises because while “Sanctuary” is what I call a filler episode, it does present us with some intriguing secrets and links further connecting Ichabod (Tom Mison) and Abbie (Nicole Beharie).