The cut sublime, is to admire the top of King’s College Chapel, or the beauty of the passing clouds, till (the obnoxious person you wish to avoid) is out of sight. The cut infernal, is to analyze the arrangement of your shoe-strings, for the same purpose.
It doesn't work if the OP doesn't recognize it, of course; and who recognizes the cut direct these days? They come up and talk to you anyway.
(PS- I too was sorry that 'fan language' wasm't the other kind of fan.)