Merrin is going to translate that, tentatively with high mental uncertainty bars, as ‘Esta is scared and hurting and feeling out of control of the situation, and reacting to it by trying to feel more in control, specifically by being mean to Merrin in ways that upset her.’ This is a pretty appallingly immature dynamic for anyone over the age of six to slip into - honestly, even having to bow out of a conversation because you caught yourself wanting to upset your conversation partner on purpose is an embarrassing degree of dysregulation and yeah that's probably part of why Merrin is so reluctant to nope out of this conversation...
...It's inconvenient that the reframe does not actually stop it from working. It feels like it should! But apparently that would require Level 5000 Emotional Maturity and Merrin is only Level 4000 or something and so, in fact, she is upset and bothered by Esta boldly stating that he would ??enjoy seeing her be upset about failing to rescue him from Hell??, as though Merrin being upset would in any way be one of the top 100 most important aspects of the situation, and the fact that she's additionally upset on his behalf is making the conversation more rather than less painful.
- it would bother her a whole lot less if she were framing it as a Professional Mode Merrin interaction with a patient, as opposed to the thing she's doing right now, which is closer to Professional Mode Merrin with a coworker. But for some reason her mind is reluctant and grumpy about doing that reframe? That's interesting. It feels - defensive, protective - on some level she really doesn't want to be using that social script with him, and her brain is not immediately feeling like volunteering a reason why not. Hmm. Note to self to think about that, too, like everything else it'll be about a thousand times easier to think about when he's not RIGHT THERE STARING AT HER.
Merrin does not want to argue with Esta about dath ilan's belief that obviously it's possible for humans to iterate toward thinking in Reality-tracking ways. She doesn't really want to argue with him about how in her culture, learning that you were being stupid and making a mistake is obviously good news because it means you have the opportunity to stop.
"Noted," she says. "- I don't actually think this conversation currently looks time-sensitive enough on my end that I want to continue it right now, rather than using my remaining Share Language time to record vocabulary for later. I'm upset about Hell and I do not have infinite emotional maturity about that, and I'm going to have a lot more capacity for dealing with you - repeatedly reminding me that you're trying to be Evil on purpose - once I've had a day to absorb it and make all of my emotional updates. I'm pretty confident I won't stop wanting to keep you out of Hell regardless of how unpleasant you are to be around, because liking you as a person is not why I care about that, but it's not great for our working relationship and regardless of what my other plans include, we are still stuck living in the same cave. What I'd really like is to be left alone for a bit. - honestly I had felt pretty confident in my prediction that you would want to be left alone, and that seems to not be true. If you do still prefer not being alone right now I don't mind talking, just, I would like it if you can stick to topics that don't," make the imaginary Kalorm in her head give her intrusive thoughts about how entertaining it would be to punch him in the face, "upset me."
She's mostly expecting that Esta will think it's amusing that she thinks he would care about what she would like, and will somehow take it as an opening to be even more socially unpleasant, but she figured she might as well try the polite emotionally mature route first. If he doubles down hard enough on the being-obnoxious strategy, Merrin can just try to put on her armor and leave, and if he escalates to physically stopping her, well, she'll figure out what to do at that point if it comes to it, and whether that happens would also be rather useful information about the prospects for their working relationship, since Merrin demonstrably cannot just avoid all conflicts by being high-agreeableness at him, and being able to tell someone "no" is, in fact, a pretty critically loadbearing element of being able to work with them on anything, according to dath ilan.
(In almost any other situation, Merrin would be wrestling with enormous quantities of pre-emptive social anxiety while imagining any of those agonizing mortifying interactions. Right now she's still on the other side of that, and really the least important element of any of this is whether Merrin finds it awkward.)