It's being run backwards and looks great that way. Imagine playing a couple of pool games and then singling out that one really cool shot you made, and start b

It's being run backwards and looks great that way. Imagine playing a couple of pool games and then singling out that one really cool shot you made, and start by saying, "that pool shot is how I play pool." The parasites did their thing just fine for each individual organism. But that one random one that happened to cross wires in just the right way ended up doing orders of magnitude better. A rare occurrence, but very advantageous once it happens.