Where did Katherine go when that unseen force whisked her away from Bonnie? Bonnie said that who passes through isn't up to her, so obviously whoever it is up to is the one who took Katherine, but who is it and where did she go? Was it the Spirits who command the witches or was it some other sort of higher power that is in control of the Other Side? If the Other Side is supposed to be a purgatory then maybe Katherine has gone to hell for all of her crimes. Theories anybody?