What if you’re dealing with a demon who isn’t weak to salt? What if the rules on salt circles require the salt to be on the ground, so a salt ring in orbit does nothing? What if the salt ring doesn’t meet the salt density requirement to ward off demons? What if the demon never leaves earth, instead hanging out at a coffee shop, and thus the demon doesn’t have to cross the salt circle to get to you? What if the demon simply grabs your soul after you die?