The background is dark because round trip distance between flash and sensor is a factor of ten or more bigger for the background than the subject, giving a factor of 100 more light from the subject than the background; and the ambient light is negligible compared to the flash.
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no subject
It's a wire fence.
The background is dark because round trip distance between flash and sensor is a factor of ten or more bigger for the background than the subject, giving a factor of 100 more light from the subject than the background; and the ambient light is negligible compared to the flash.