I didn't know it at the time of making this video, but this "double rainbow" is actually a DOUBLE CLOUDBOW! According to Wikipedia, "The fogbow's lack of colors is a result of the smaller water drops... so small that the wavelength of light becomes important. Diffraction smears out colors that would be created by larger rainbow water drops."
Thanks to Casey at Modern Hiker (modernhiker.com/2011/01/19/broken-spectres/) for unknowingly pointing me in the right direction to solve this mystery.
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