"No. It is - all right for now." It's not actually running into his loyalty compulsions, particularly; he can notice the shape of them in his mind, the directions they tug, but it's never been something he was trying not to look at, and he's not confused; he designed the compulsions himself. He wouldn't be able to make actual concrete plans to defect against the Empire, or leave, or take the current Emperor's place, but other than that, his at least do not particularly restrict his thoughts. Altarrin needs his own mind as intact as possible.
They are probably related to some of why it hurts so much, but - only some.
"...Please count off each minute to me as it passes," he says, his voice level and expression unflappable again. "If I - stop acknowledging you at at any point - then please dispel it then. Or if it appears to be having some very bad effect." He will have to trust her judgement on that.
So. Carissa.
He has so many unanswered questions: about Golarion, about magic, about her history, about how, exactly, Keltham changed her after his arrival, and what gave her the courage to think at all, and then to - set herself on a course to oppose Asmodeus, it must have been so dangerous - still will be, for the version of her that stayed behind minus some memories, if she's right about how that works.
What did she say...
We deceived Keltham for three months, but then he figured it out and exercised his compacted right to depart, and I was in charge of managing the project in his absence. I had some disturbing realizations that made me less useful to my superiors, decided to set myself on a more practical course and then erase my memory.
And what didn't she say? He has less clarity on her unspoken thoughts, relayed through Ellitrea, but:
1. Her realization that circumstances had changed, that Asmodeus' victory was no longer guaranteed.
(If it had ever really been at all, or was that claim always Chelish propaganda?) (And the relevance, the analogy to Altarrin and Velgarth's situation, is obvious - but it hurts, and that isn't obvious, it's not straightforwardly a compulsion-conflict -)
2. Realizing that she was fighting on the wrong side.
(Assumption: that it mattered which side she fought on; that she was powerful and clever and knowledgeable enough to be a huge advantage to her allied side, if not necessarily decisive on her own, but - her choices could be decisive and she was able to realize that, recognize it, see the opportunity and the stakes and -
- and he needs that Carissa here but at the same time his mind is trying to flinch away scaredscaredscared and he knows he's not looking at what's beneath that, maybe with an even bigger Wisdom boost he would make that leap but he isn't, yet)
3. Realizing that Keltham was already going to take the fight to Asmodeus, and would risk destroying the world. Or the multiverse.
(And she thought that she had ended up somewhere worse, she was thinking that if Keltham knew that then he would be less careless, and it's really no mystery at all why this hurts, but while under a mind-altering spell is really not the best time to ask her if she still feels that way now that she's had some time to get settled and read the histories)
4. She thought none of it would make sense to him; that they would see her as an insane and useless slave.
(Ouch.)