How does mind control work?

I have one guy able to mind control, he is now level 5 and has 16 willpower, brought him along for a mission and when I hovered above the mind control icon all I saw was a red ring around him but no available targets even with a couple of aliens shot to pieces.

Of course I don´t want to mind control an already almost dead alien unless it perhaps could be useful for capturing maybe? I wonder if you can capture them that way.

Anyway, couldn´t get it to work, does he need direct line of sight? … I never gave that to him since he is rather squishy and didn´t want to put him in harms way. Since it gave me a red ring with a very short range I assumed he could mind control anything within that if the stats allow it.

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