"While they're present in my world people can jump quite high. Even without equipment they can jump twelve feet straight up. That's not something they can accomplish in their world. They can also sustain running at 15 miles per hour for as long as they wish to."

"Wow!"

"And that's just the baseline, with the right equipment people can fly and run really really fast, though it can be hard to keep track of where you're going at that speed."

"Nothing about the place helps with that?"

"Oh it helps a lot with being aware of where you are. There's only so much it can help when you get close to breaking the sound barrier on foot though."

"I wonder how fairies deal with that."

"That's a good question. I think flying helps a lot. there's less to run into. I also think being indestructible helps. It certainly helps people in my world that anyone capable of that in my world doesn't get hurt from running walls or the ground."

"...do they get hurt from running into other things?"

"Only things that are dangerous to touch at all like monsters and traps and sometimes lava."

"Only sometimes lava?"

"People swim in lava all the time with the right equipment or potions. You don't even need special equipment or potions to breath as long as you don't burn to death."

"...does... making yourself unable to burn to death... also make you not need to breathe?"

"Now that you ask... it doesn't. For some reason people can just breathe lava in without issues even though they can't breathe in water or honey without special potions and suffocate in space."

"That doesn't make any sense."

"It doesn't. It's still how things work though."

"Maybe your lava isn't even molten rock? If your ice isn't frozen water."

"I don't think things generally do phase changes in my world... the closest thing I can think of is the solids that form when two liquids touch each other. That consumes some of the liquid... or maybe replaces it."

"Okay. So your lava is different and maybe it's exactly like that amniotic-fluid-kinda stuff that people can breathe, or something."

"I don't really think my world works quite like you're thinking. There are rules about how things work but they aren't really connected. People don't inhale in lava or water or even air really. They just need to be somewhere they can breathe."

"So if they're somewhere they can breathe... and then hold their breath...?"

"I think people have tried that and nothing happens."

"Wow, what the heck."

She shrugs. "I don't really think about it unless someone brings it up or tries to experiment with things."

"Not really a science sort yourself, huh?"

"I think I'm closer to an engineer than a scientist. I can see the rules underlying how things work when I'm home and I can change them. I don't always know what the implications will be but it's a different starting point from trying to discover the rules. People do still surprise me sometimes though."