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I couldn't figure out why I'd stopped, nor explain it to my friends until I was just able to make out against the leaf litter, a fer-de-lance, or a pit viper, poised to strike.
That's pretty creepy. Considering the survival advantage in detecting such a threat, I wonder if something deep down in your brain stem was raising the alarm, while your cortex was busy with thoughts of those annoying thorns and wondering what's for dinner.
I have read that what you're suggesting may in fact be the case. I can't find the exact article, but it was based on this, I think.