"There's lots of spells you need a wizarding license or permission from someone who has one to cast."

"Right, the general principle is sound, I'm wondering why summoning willing subjects in specific is one such spell."

"Oh, it's large potentially dangerous ones in general."

"Ah. Yeah, I guess that makes sense, what with the wards."

"Yeah, summonses usually have wards built in and they're heavy duty but easy to break."

"Easy to break from the outside I expect? I did not have an easy time even scratching it from the inside."

"Yeah, from the outside, it's a physical trigger."

"Why are they? I presume they're easy to break like that by design."

"It's not so it'll be easy, it's so it'll be obvious if it's happened."

"Can't it just be made visible instead, or something?"

"Wards aren't. I'm not actually sure if anyone's invented a visible ward; maybe they should..."

"It sounds better to be visible and hard to break than invisible but easy to break if the objective's just being obvious it's happened."

"It might be hard to do somehow. Hadn't occurred to me, actually, I'll need to look into it -" He writes this down.

"So can you do some more wizardry of various different sizes for me to see how it interacts with your channelling capacity and whether I can get one and how the flaws emerge?"

"I can just do number reads if what you want is sizes?"

"Number reads?"

Gesture, word, the number six floating in the air. "A spell that just says how much power I pulled."

"Oh. So you can just pull arbitrary amounts of power within your limits and show a number? Does the number mean anything?"

"Means the amount. I pulled six units; if I did the gesture for a hundred and twenty-two I'd get that." Demo.

And he watches how it interacts with the channelling capacity.

"What's a 'unit'? Is it a natural measuring system or is it something invented?"

"Natural - is that not clear by looking -?" The power goes through the CC very very fast, possibly too fast to catch.

"Not really—it goes through really quickly, kinda difficult to pin it down, and given how fragile dragon magic seemed to be I'm wary of trying to—hold it or something—actually, hey, can you cast a spell that's permanent-until-you-remove-it or something?"

"You've got like four of those on you right now."

"Yeah, but—well, I guess you can cast them on me again." He looks at them, and looks for any connection between them and Kaylo.

"I can't cast the same ones on you - well, I guess I could duplicate the one I didn't cast, but that class of spell it's one active to a caster at a time -"

Yup, if he tilts his perspective just so, that's totally what that looks like!