Please ignore Royston Blake's aggressive sales technique. He will not really escape from Mangel and track you down. When push comes to shove, I think we all know that escaping from Mangel is beyond him. And so is effective, considerate promotion of the books he calls his own. So, you are welcome to peruse his chronicles and procure one or two if you wish, but there is no implied threat of violence if you don't. I can't confirm that he won't get Nathan the barman to perform some kind of magic ritual against you, though.