The only flaw I can find in this is that I would have expected the person finding this out to have left just one enemy on screen, not two. They're much not dangerous in pairs, in my experience on Galaga...
This reminds me that one of the tricks I used to use to identify which difficulty jumper the game was set to was to leave exactly 1 mothership on the first board. If it would try to capture your fighter after a few sweeps through, you knew it was on the easy jumper setting.
