Originally Posted by aznxk3vi17
Some have theorized that it's line of sight, which is a possibility, but we have not been able to reliably position the shadow twin properly out of sight while keeping the tanks in sight for heals. Because of this, we have several of the tank healers close to the shadow twin wearing some shadow resist. However, as I've said before, due to the fickle positioning, we are never sure if the images reaching the raid are due to the fact that they are in line of sight, or that the mechanic simply does not work that way at all.
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It's much more likely that the Shadow Images cast a Fixate periodically on a random person who is in LoS. That's why, if you tank Sacrolash up top with your tanks on the ledges, they'll bang on your tanks at first. In the process, the Images get on the ledge. They are now in LoS of everybody basically, and are free to pick another target to Fixate on. However, the few seconds they banged on the tank up top is generally enough time that they despawn just before reaching the raid. (The LR video clearly shows this)