(Mage-sight is not detectable as magic, no.)
That's fascinating. It's different presumably because it's not exactly a spell, but a repeatable-miracle from Aroden?
And then he's calm, just like that.
It doesn't seem to be otherwise shifting his thoughts directly, but - a lot of what had felt like content in his thoughts, or observations about the world, turns out to have been mostly emotions? He can be aware that he doesn't know very much about the place where he finds himself now but he isn't disoriented about it, it's just a neutral fact, that he can if he wants address by looking around or by, you know, asking. He's aware that he's missing a lot of context on Aroden and on Iomedae's history and on whoever Alfirin is, but he is no longer experiencing the painful confusion that feels half like physical dizziness. He's not scared. He doesn't exactly feel safe either, he's just - neither of those things - and he can think about the facts of the situation, where the most relevant one is that Iomedae is right here, accompanied by her probably-comparably-powerful ally, and he just brought them diamonds that were apparently vastly more valuable to them than he had actually realized, and this...is unlikely to be a situation where Iomedae is going to let anything happen to him.
He doesn't expect the feeling of calm to last. Minds form habits and he's no more immune to this than anyone, just - better at being mindful of it, of retraining habits he doesn't want to have. Which takes time, and he has, in hindsight, spent weeks terrified and miserable and trapped, and those pathways aren't active right now but he can tell that they're still there. And - not even entirely inappropriate to the situation, he came here willingly - mostly - that's complicated actually, but he did at least come here because he believed (and was probably right to) that it would be overall a better position to achieve his goals, to be trapped here rather than trapped in the Empire. But 'trapped' isn't the wrong description for it. They are, quite reasonably, preventing him from running away. Also he's in the middle of the camp road and none of his talismans are working right now - he hadn't noticed before, not until he could use mage-sight - and right now the reflex to be very distressed about that isn't activating but this is absolutely something that would under non-mind-control circumstances be stressful.
Also, the Empire is still in the middle of three wars and he probably can't go back and he - he didn't, actually, think through the cost he was paying there, because in order to do this at all he had to approximately deceive himself into thinking it had already been paid. He doesn't know what would really have happened, if he had returned to Jacona as ordered, but 'immediately being assassinated by the gods probably isn't the most likely option.
Bastran is going to be terrified and will do what he predictably does under those circumstances, which is mostly 'whatever his advisors pitch to him as being paranoid enough', and this will predictably go badly and - he doesn't want the Empire to collapse, whatever its flaws, the alternative is still worse.
Nothing he can do about it right now.
What he can, maybe, do something about, is Iomedae's war. He wants to help with that. More than he already has with the diamonds, probably, though he needs to coordinate that with Iomedae on that, a lot of his usual strategies would be rather attention-drawing here and it's probably not worth the cost of Tar-Baphon getting suspicious enough to investigate.
(He doesn't say anything, yet. They warned him the spell was short-duration and he's trying to use that time as well as he can, dragging his mind into something resembling order, trying to arrange his priorities so that he can push through for a while by leaning on the urgency of Iomedae's war. He does at some point have to deal with - all the things that are agonizingly painful to think about when he's not having all of his emotions calmed, the fact that his project of the last six hundred years was almost certainly a mistake - but he doesn't yet feel like he has traction on it, and it's not the thing to focus on in the middle of a war.)