"That's really interesting, too, oxygen is, like, what makes us have free energy in the first place."

"Yeah," he shrugs. "I'm curious about my biology too."

"Are there any experiments we could run on that with the materials we have on hand?"

"None are suddenly coming to mind? We could try testing my regeneration some more but I don't know about actually testing how I function." Shrug. "I'm not a plant so we can't just feed me food dye, see if my circulation is working properly, and I don't know any blood-safe dyes for us to use as a separate point."

"Would blood unsafe dyes be actually unsafe to you?"

"Not sure, but we haven't tried injecting me with unsafe things to test that I can cope with them fine, we've only really tested minor wounds."

"And I'm not sure it's very smart to do so in case they are unsafe."

"Exactly," he responds. "It'd be nice if we had some sort of assurance that I was immortal and would regenerate from everything but so far it's just been that by the way I don't appear to need to breathe, I didn't fall unconscious when practically drowning myself, and I can heal from small wounds."

"...which is kinda suggestive, but yeah."

"It is," he allows, "but it might turn out that I can only heal up from wounds that damage less than five percent of my volume, or it gets exponentially more difficult to recover as it's worse, or I'm only able to recover from cutting trauma or whatever and not flames. So, if we keep testing more things, probably test small things and work up slowly."

"Mmhm."

"… So we could test heat, see if I burn? I'm going to guess it's at least painful but I'm not sure it'll have any visible effects, seeing as how sunlight is painful but doesn't seem to have any?"

Ow.

"It's your body..."

"Just checking none of you are going to raise objections, and it might be a good idea for one of you to get sway over me in case of unpredicted weird results – you know, testing safety and stuff?"

"Yeah."

"I'm kinda morbidly curious."

"So do you want the sway, then? Seeing as you other two haven't expressed either way if you want to be present or not…?"

"I'm curious too," says Matt. "And like Sadde said – it's your body, I don't really raise objections to it if you don't."

"Yeah, that works."

Theo waits patiently while she records him.

Matt will take some chips from Sadde.

(Nom.)

And eventually she has enough sway.

And Theo does realize that now is the time for him to go test his regeneration, because Willow has a morbid curiosity!

Into the kitchen he goes.

She follows.