She's now at 53.300 / 64.000 / -100.931. So she's not perfectly lined up with the X or Z axes.

Well that makes some sense, she's not a perfect cube. However cubelike her current form seems to be. She makes a (somewhat literal) mental note of which direction is which, and turns ninety degrees to verify that it isn't based on which way she's facing, it's an overall factor of the world itself. Relatedly, if she hops, the middle number will change, right?

When she turns, the "Facing:" changes, as does everything after "Targeted block:", but the XYZ does not. If she hops, the middle number does indeed change! It increases to 65 point something, it's hard to pick out exactly how high she gets.

Neat!

…

Okay now she’s going to mess with it. She bets she can change those numbers, since they’re referring to where she is. Can she change the middle number to 65 and thereby teleport one block up?

Yes.

"Hey-- whoa, you're floating, how are you doing that?"

Talking! Real actual talking!! Yay!!

The person standing before him is a... silhouette that looks out onto a starscape. She moves, and even waves at the person before her, but the starscape doesn't. It's like looking through a cutout to another world.

"Hi! Oh, I am, aren't I. Oops. I expected gravity to put me back. I changed one of the coordinate numbers to see if I could."

...Wow. Okay.

"You-- you changed one of the coordinate numbers?"

"Yes? ... Is that against the rules? Actually is there a list of rules somewhere, I already broke one by accident."

"--Against the rules--it's not supposed to be possible?

Um. The rules are-- no breeding villagers, no iron farms, no going to the end. Theoretically no stealing, no murder, no griefing, but those aren't enforced so nobody listens to those."

"Wow, okay. I don't... even know how I would farm iron, it's a metal, not a plant. And breeding villagers sounds, uh." She pauses and tries to come up with words. "... Morally reprehensible and furthermore gross??? The rules about stealing and murder are just suggestions? And what is griefing."

"--Griefing is like... pranking someone's builds? Putting a mustache on a statue, setting their house on fire, that sort of thing. Where are you from?"

"Oh. Uh. Earth? Actually do you know where that is, I have been trying to get back and I don't know how!"

"...We share a border with SMP Earth, it's where Wilbur and Phil came from, but I'm pretty sure I would have heard of you if you were from there."

"I was not nearly as inexplicable and terrifying when I lived there, I'd have been very easy to miss. A border? ... Is SMP Earth made of cubes?"

"...Yes?"

"Then... no. Wrong Earth. I come from a place that is not cubes."

Their conversation is interrupted by a teenage boy running up to them. The nametag over his head indicates that he is TommyInnit. "HOW OLD ARE YOU."

"I'm 24, Tommy, you know this."

"Yeah well I wasn't asking you I was asking the new person."

Oh. It's this person.

"Wow. Hello to you too. Nice to meet you, I'm Yvette," she sniffs, irritated. "I don't know. I was 15 when I was eaten by an eldritch book and teleported to another dimension and turned into whatever-I-am. And I didn't count since because it was depressing. It's been a while."

"Were you born before or after April 9, 2004."

"Before."

"....Wait that's what Ranboo said too. Are you trying to trick me?" He eyes her suspiciously. "That means I'm older than you, right?"

"Is April 9, 2004, your birthday?"