I mean, Sabrina's soul is strange, we know that more than a few abilities don't work on us because of it. We know that we have some odd things going on in our mind and I'm sure that they'd show up to a mind-reader. So I started writing "Take the weirdness that's our metaknowledge and moderately-superior multitasking and super languages everything and emphasize that until it becomes too confusing for a hostile mind-mage to target", but then I realized that I might as well just say "brain-damage".
"Alright," you say. "Hit me."
Sayaka raises a hand glittering with borrowed power -
heh, it's like she's got the infinity gauntlet too - not that this is the time for jokes - but she still hesitates. Even the sensation of her magic is reticent, apologetic as it encroaches upon your mind, no matter that you're kind of asking to be invaded over here.
"Is something wrong?" you ask.
"Kinda?" Sayaka winces. "I don't wanna rag on you for being cagey, but you've kept a lot of secrets for some very good reasons. I guess I still kind of expect you to have more?"
"It's okay," you laugh. "I am pretty cagey. But if there are any big secrets left up here, I trust you to know them."
"What about the little secrets, then?"
"Well, me and Mami would rather you
didn't peek at our date night memories, but that's just embarrassing, not existentially threatening."
Sayaka rolls her eyes, her magic still soaking into your mind, and your mind starts wandering again. If she can't take the heat, then you can keep your mind on normal things. Like the infinity gauntlet. How many power gems
would it take to establish a limited omnipotence, anyways-?
"Sabrina, why exactly do you remember a timeline where I married Kyoko and had a child?"
"I dunno! Probably for the same reason that I remember you turning into an angel, despite the fact that that's never ever happened. I know you've never turned into an angel, by the way, because if you had, you would be directly incarnated here to help this incarnation of Madoka, and you would remember your existences from across all timelines, so you wouldn't be surprised by my hypothetical brain damage knowledge."
"I hate you so much right now," Sayaka says.
"It's not my fault all of this is rattling around in my head!"
"It is 100% exactly your fault for making me take David Lewis seriously again."
"Don't be ridiculous. Different possible worlds are causally isolated by definition, so I can't genuinely remember other possible worlds to begin with. And if I do remember them, it's only because memory is a special case of imagination. Which I'm asking you to investigate for brain damage. Any progress on that, by the way?"
Sayaka thins her lips and pulls away, so it's probably bad news.
"First things first, I've been testing these powers on some other volunteers. Magical Girls and ordinary humans."
"To establish a control group for me, right?"
"Yeah." Sayaka tries to laugh, but the noise comes out a little flat. It drips out of her mouth and splatters against the floor. "I can see why the girl I got these from was, uh, such a bitch."
"Why's that?"
"People look... weird, under these. They're predictable, I guess?"
"Oh," you say. Distantly, some part of you is rummaging for 'compatibilism 101'. "I'm sorry for being a deterministic entity? And really glad that you're not being a misanthrope about this."
"Nah," Sayaka says. "People look weird when I read their minds, but I look weird when I read my mind, too, and we're all still people. The
really weird thing is that you're
not predictable, Sabrina. You don't seem to have a brain to damage or a mind to read."
...okay, that
can't be right.
"I definitely
feel like I have a mind," you say. "I suppose it's
possible that I don't have a mind, but my suppositions have no bearing on whether I have a mind or not, so I'm only entertaining the possibility in order to think about the implications for other people. By which I mean to say that Mami would probably appreciate it if you don't tell her I'm a vegetable."
"Oh shut up," Sayaka says. "Two days ago, I couldn't see the hippocampus, but I still figured it existed. I'm not going to assume you're brain dead just cause I can't get a good look at your thoughts."
"Thanks?" you say. "Um, I'm sorry for being a purely epiphenomenal entity? And really really
really glad that you're not being a misanthrope about this."
Sayaka gives you a shove.
"Seriously, though, what do I look like if I'm not made of predictable mental clockwork?"
"You look like a clock without the clockwork," Sayaka shoots back. "The hands are turning but no-one's home to turn them. Thoughts are appearing out of nowhere like dad jokes and bad puns to the face at a kilometer a second."
"Huh," you say. "It must be divine intervention, then."
"Excuse me?"
"I mean, if
I can appear in Mitakihara out of nowhere, there's no reason thoughts can't appear in my skull out of nowhere, too. It's simple stuff. I'm an actively sustained miracle upon the face of the Earth, and my thoughts are the axiomatic emanations of first movers. No biggie."
"For the
last time," Sayaka says. "Just because Madoka
might have intervened with godlike powers, that doesn't mean she's actually a goddess."
"What do you think a goddess
is, Sayaka?"
"Someone smart enough to boot her heralds up with common sense," Sayaka says. "See, you'd better thank me for being as mortal as you are, 'cause if I
was one of Madoka's hypothetical angels, you know there's no way that I'd ever be able to put up with you."
"Sorry, did you say something? My counterfactual, transcendental oversoul doesn't want me to listen to anything that makes me feel bad."
"I said that you have even less common sense than the vegetable your brain seems to be."
"Aw, Sayaka, that's so sweet!"
"You suck, and if gods are actually putting this nonsense above all else in your head, I'm gonna become my Ultimate Self and overthrow the divine order."