I was simply going to edit my previous post here but now with other posts, I probably should make a new one. So I will.
Fordim's question about whether the Emissary was using his Ring for invisibility has worked on my imagination this morning. I have gone back to edit my post yet again, to suggest some ways in which he was himself brought under Annatar's influence. And to suggest that he is as yet new at all this. I thought such a proceeding might give us more room to explore his own psychology. Fordim, since he is your character, I hope this is okay. I know you don't want him to overstep Faroz's own story.
And now I will simply wait for an appropriate point in the game where everyone else's posts will inspire me to decide what it was precisely he learnt about Bekah.