Exactly, he did what people do all the time; making predictions about the future. In this case he was wrong, but the reason people are making predictions are because they often get them right; they often get home before dark, or it doesn't rain that day etc.

The alternative to making predictions and therefore sometimes get it wrong, is to slavishly carry everything, every time, every where, and never forget. Having dynamo lights means that you never forget the lights or recharging them and that you never need to make predictions about needing lights or not, so you never guess wrong.

There may be many different reasons why the ninja cyclist doesn't have lights on his bike; he forgot, they broke down, he made a wrong prediction, force majeure etc. But chances are, that if he had dynamo lights on the bike, then he wouldn't be a ninja cyclist at all.

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Regards