Originally Posted by Malazaar
It is definately not LoS-based. I don't know for sure but if you DPS Sacrolash first, they never attack your Melee DPS and Tanks - which are in LoS from the very beginning.
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It isn't a matter of it being a binary state. It isn't that either the targeting is all LoS or LoS is irrelevant.
Shadow image targeting is the weirdest and, for us, the most frustrating thing about this fight. My guild must have tried about eight different positionings to minimize images and even after the kill, we're not sure exactly how they work. We know that although it's not entirely LoS based, LoS is a factor. You can easily confirm this by separating your Sacrolash and Alythess groups and parking Sacrolash somewhere (like in an upper corner) with her group out of LoS of the Alythess group. Images won't even try to go for for the Alythess group.
So far our working theory is that they go for random players in line of sight, preferentially (but not exclusively) outside of 10 yards, much in the same manner that Illidan chooses targets for Agonizing Flames. If all Sacrolash can see is targets <10 yards in LoS, she will hurl images at them. Images don't appear to change targets unless they are on a target less than 10 yards away and come to see another target which obeys the "rather be >10 yards away than not" rule, or if their original target dies.
Intuitively this theory has way too many parts for it to be the likely actual mechanic behind their targeting, but it's the only thing we've found that accords with our experimental data.