The problem here...
...is that neither actually saw the crop circle being made by the light. And more problematic, their claims cannot be verified.
What makes Talbot's tale suspect is its highly coincidental nature. She, a crop circle advocate, just happens to be there for the "event." It allegedly occurs in a field of crops not typically targets of circlemakers. And the circle photographed is quite simple - actually its pretty pathetic.
A credible witness would be someone entirely unfamilar with and unbiased about the phenomena. Talbot is not, she's been running around for years trying to make money on crop circle "research."