Originally published in `Interzone #48', June 1991. There are multiple realities. As the narrator puts it, `the number of parallel worlds is uncountably infinite - infinite like the real numbers, not merely like the integers.' The narrator has to kill a man across the realities to prevent him from tearing the universe apart. He is `stable' meaning there is little to no variation between all copies of him across the realities. However, he is eventually put out of action by being blown into `Cantor dust' (his selves are put, so to speak, in the cantor set instead of the entire interval) making him ineffective, since his copies are nowhere dense in the realities, so cannot really affect them enough.