Either they edited the article or I didn't really read it.
Quote:
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Originally Posted by BBC
So what of the third bow? This is known as a reflection bow. Whilst rare, a reflection rainbow mainly occurs when the sun is lower on the horizon behind you (i.e. late afternoon/evening) and when you are near to a large body of water, such as a river, lake or sea inlet.
Sunlight reflects off the surface of the water and through raindrops, but at a different angle to the direct beam of sunlight.
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That's probably what it is, it matches the geometry too.
Reflection rainbows formation