"Teleporting your body to another universe uses less energy than walking in a straight line."

"If I'm walking for several days, it does!"

"That's fucked up."

"Human bodies are pretty expensive to run, energy-wise, even if they're efficient for an organic system - so putting my body in the alternate universe also reduces the base running cost, since it isn't moving or thinking, and it's in a sterile environment and the immune system is on pause."

"Okay, but- how the fuck do you know that, if it's an alternate universe. What if you try to get your body back and it's been gored by a fucking moose, or whatever."

" - Oh, it's empty. Like, literally featureless white void, except for some stuff relevant to alchemy. It's specific to a given alchemist, too, and under normal circumstances other people can't get at it - mine used to be linked to my sister, during the time span when my body was... Inoperable, it was actually in that universe, which is why we know the ongoing power draw since my sister was having to fuel it."

She shakes her head. "What the shit."

"Esoteric alchemy's weird like that!"

"You know what's not weird like that? Walking places. With your feet."

"But it's slow! And it's a bit weird in my home universe, if you're going that far most people use trains or general vehicles."

"Carrying you wouldn't slow me down much."

"Would carrying me bother you - ?"

"Why would it?"

" - Lots of humans get touchy about personal space." 

"Well, I'm not a human."

"And I'm unusually fond of touch! So don't mind being carried." Or, possibly, draping herself over her companion like a large cat.

"So no fucking around with alternate universe whatevers needed."

"Only fucking around for fun, got it."

Sigh.

She laughs.

"Ready to go, then?"

"Sure."

Best way is if she gets up on A2's back, then.

She clambers up! (She loops her left automail arm around A2's front, locking it to reduce the chance she falls off.)

Her sword obligingly resets its position out of her way. She'll hook her arms under Bellona's legs, and then-

Away they go. She starts off with a leap off and away from the rock face, flexing her knees to absorb the impact of landing and using the position to push off into a fast sprint. She hits her stride quickly, the wind and trees whipping past.