I can't seem to retarget spells like Chill Fog that a member of my party has started casting under AI control. The targeting reticule just snaps back to the target NPC. Which is kind of a bummer because they tend to hit half my party as well. Is this intentional?

What happens if you deactivate AI first and then try to retarget?

I just tried that, it didn't work either. To me, it feel like the problem might be that when the AI casts a Chill Fog, it targets an NPC, whereas if I cast it, I target an area on the ground. Retargeting a Fetid Caress, which works the same for me and the AI, is no problem.

Weird indeed. Nice testing by the way!