Can't fathom lines of sight

[Wargasm]

I’m almost appalled by the thousands of hours I’ve spent playing the game, but still I can’t fathom the lines of sight for ranged attacks. See the screenshot attached. How can the green archer see the raider in the worn mail shirt and the thug in the white gambeson (both immediately behind bushes and trees that are immediately to the archer’s right (when facing said raider and thug), but not see the marksman/poacher in the blotched gambeson that’s several tiles behind the same bushes and trees (to the archer’s left when facing the marksman/poacher)?

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   LoS_Lack-of-Clarity.jpg
   

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