i haven't seen the video so i can't say for sure but modern cameras like sionyx aurora can record in dark like a DNVG , the video generated looks like it is dusk but in reality it would be dark .
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IF someone can link me the source video i can confirm if its actually dusk or a Digital NVG footage ( DM if possible) .
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2. for search parties we really don't know , maybe they had solid intel but had limited manpower thus decided to split up to cover larger areas and responding parties were hindered due to dark .
3. If the face dosen't match then he must be someone , beheadings don't occur regularly