Well as long as that seems safe to do around someone who may or may not be thinking of you as a midnight snack - wait - 

"It occurs to me that if you do in fact have a supply of stored blood around here being able to see that would be pretty convincing evidence that you did not just make that up and have another source and are less likely to try to eat me the first chance you get."

"That seems logical," he says, standing up from his chair and heading for a different door than the one they entered the library through.

She follows.

There are hallways, which he takes miscellaneous turns down before coming to a kitcheny thing, if a kitchen lacked most of the things that make it a kitchen like a stove and spices and ingredients and so on. But it contains a sink, and a dishwasher, and some cupboards, and a large refrigerator, the latter of which he opens and retrieves a plastic bag filled with blood. He opens a cupboard, takes out a tall glass, rips open a corner of the bag and pours in the blood, and then drains the glass.

"Wow, what is - what are all of these?"

"--Which? That's a refrigerator, it keeps food cold. That's a dishwasher, it washes dishes."

"...That seems like a rather elaborate contraption for washing dishes but I guess your magic is different than mine. I'm assuming the thing above the basin is for water but it doesn't seem to have a pump, is it magical? Also whatever cloth that bag is made out of, we don't have that."

"None of this is magic."

"...How do you have a cold-generating box without magic? How do you have a - a - pumpless pump without magic? ... Wait, are the lights nonmagical? Is this entire house nonmagical? I think I would like some more explanations. Your servant never did get around to telling me what a phone was."

"She's not my servant, she's one of my blood donors. The house is heavily warded, but nothing you'll have seen so far is magical, including the lights. A phone is a device that lets you speak to someone far away who also has a phone."

"I am not sure how you have all of this stuff work without magic but it's pretty great. Anyways, now that I'm not worried you'll eat me if I look away for a second, I'd like to try that beginning ritual, is this a good place for it?"

"It is adequate."

Then she will do the ritual!

It takes about an hour and she has a little bobbing light at the end of it.

"Wow. That took a while. How fast would it have been for you?"

"Savk."

Small bobbing light.

"And how long did that take?"

"Oh, a few weeks."

"Oh that's so much faster than I was imagining. I wonder if there's a way to get my rituals to talk to yours, I could maybe get around a lot of energy roadblocks that way. Can we do some tests?"

"Absolutely."

"OK so the first and simplest test is if my magic can detect yours without needing a spell specialized for it, next would be to see if mine can directly affect yours, I can do both of those tonight but my test for the second is trying to dispel one of your effects which depending on how your wards are set up we should maybe do outside. I'll do the first one now, though - " And she casts detect magic.

There is a hell of a lot of magic around.

"It worked! Oh, wow that's a lot. We should definitely go outside for the next test, dispel will probably work if detect does, relative power of the casters matters but in the sense of how much energy gets put into the spell or the dispel attempt. It's possible that since your magic doesn't cost anything to cast it might not be very durable. And if that's the case I could probably really mess up your wards if I target wrong and that seems un-guestlike."

"I built them in a way that ought to avoid that but I quite agree that it would be better not to risk it."

Then she will dismiss her detect - it's pretty appallingly rude to closely examine someone's wards if you're not a trusted friend - and wait for him to lead her to a place with fewer breakables.