"Did Marin give you the form?"

"Yup." He waves it.

Ahin snatches it, skims it, says, "All right, so tell me about yourself."

"I'm from another world, got stranded here accidentally, can see magic, can convert potions into my world's kind of magic and also it's the only kind I can actually use here so that makes it incredibly interesting. Er, as for me me, I'm—curious altruistic ambitious extroverted sociable impatient intelligent diligent energetic dramatic—those might be a good ten adjectives?"

"Convert potions?" blinks Ahin.

"Yeah, I can usually convert one type of magic into another but all types here are either inconveniently attached to people or to the reservoir who apparently will murder me if I try to do anything to it."

"So you're less interested in being a witch than in having a source of this thing?"

"Oh I'm plenty interested in being a witch for its own sake, I'm a magic geek, I like getting my hands on as much magic as I can. Besides, it's fascinating. If I didn't need it to fuel other magic I might not have wanted to be a witch this soon but I definitely eventually would."

"Hm. You any good at cooking?"

"Yeah, been cooking for myself for the past few years."

"Yeah? What do you make? Witchcraft's a lot like cooking."

"Not sure you'll have the same dishes on this world but—" He proceeds to start listing and briefly describing a number of dishes of varying levels of difficulty from all over Galatea.

"All right, not bad. Go pick four days on the calendar that don't currently have more than four people signed up, come in then half an angle after sunup."

He goes over to said calendar to pick a date.

The structure of the calendar maybe implies that he meant four days of the seven-day week. Most of them are open by the described standard.

Oh fun. Can he come tomorrow?

Yup!

Cool! Tomorrow plus some three more evenly spaced days of the week.

Ahin has reembedded himself in witchy projects of some kind.

...he's kinda curious and wants to watch. And also "watch" with his metamancy.

The witches are doing magic when they add ingredients and mix them! Ahin is doing more of it, more precisely.

Where's the magic coming from?

The witches are spontaneously generating it, looks like.

...that's amazing. Is it when they do anything, or just some specific steps, does it work with all ingredients—he doesn't suppose he can try...?

Well, he didn't schedule himself for today, did he.

Ahin can do it when he adds anything and when he stirs, and a little bit when he shreds some leaves he apparently doesn't trust the apprentices with; the kids are more haphazard about it.