IMHO Master = Lucifer but no sauce till Q confirms.
My thoughts from pb.
Like your reasoning. But you're saying that summoning Lucifer is the Master's (priest's) job? I agree with you, that as there is a person in such a role, that person definitely needs to be caught, but that person is still, technically, a servant of Lucifer, are they not? I don't mean to start a semantic war. I understand what you're saying, and am happy to proceed with your logic. Thanks, anon.