jack has already admitted publicly that the story is about me. Snuff or not, it constitutes a thinly veiled threat of violence against my person
That would be true, except that the story in no way describes your person, and its author has more than once explicitly disclaimed any similarity even if any similarity were possible. In point of fact, no similarity is possible, because I know absolutely nothing about you. Well, except for what you provide here:
I've been advised to say no more on the subject for now. You've had your cease and desist.
Presumably, you would have been so advised
before you came back here and said more on the subject. And in actual fact, what you would have been advised by any competent attorney or any other kind of legal professional would have been to have no further contact of any kind with anyone involved.
So, basically, what little I do know about you is this: you're transparently full of shit and have resorted to making childishly rudimentary threats over a story which is a piece of wish fulfillment for someone you dislike and which you
imagine pertains to you specifically in some fashion which the author never intended and has more than once disclaimed.
Jack's commission of a story from me is between Jack and me. What Jack does with that story is Jack's business and not mine.
But if you want there to be some business between you and I, well, good luck. Your threats are as void of meaning as it is possible for them to be.