No obvious LOS issue, but perhaps the bug is related (at least blinding Eblis in the eye with the Red Mist laser beam).
I am a healer, under these circumstances, as a Rifle/Blood, so no HOTs underway, but the tank might be under a barrier effect at the time.
This bug happened a half-dozen times causing my death and group wipes until I understood the problem was the Red Mist Cast Out combo, and so circumvented by being careful not to use at anytime prior to Cast Out occurring.
The recent instance was when using RM straight afterwards which reverted me back to my pre-pull position.
The Red Mist ability/cast doesn’t complete.
Edit: I wonder if the problem is similar to the Superluminal Bridging Device/Flicker bug