 To be effective, counter thought experiments needn’t be very plausible at all. In a court of law a jury would convict provided guilt is established “beyond a reasonable doubt.” A common defence strategy is to provide an alternative account of the evidence that has just enough plausibility to put the prosecution’s case into some measure of doubt. That is sufficient to undermine it. A counter thought experiment need only do that much to be effective, and in this sense it operates like a “necessity refuter” in Sorensen’s sense.