The Octopus Learning Dots and Dashes

In our story we say, okay, the octopus is learning these patterns. It gets really good at predicting what dots or dashes are going to come next. Then it decides to cut the cable and start impersonating B to A. And so that's the point at which O effectively fails a Turing test provided that A stays live long enough to notice. Because thought experiment therefore we can have things like spherical cows or magically appearing bears.