When he's in a clearly defined location again it's on a carpet in a suburban sort of house. He's in the living room, but he can hear voices in the kitchen around the corner.

Fuck. He tries to Dimdoor back to the mansion, but the spell fizzles as if out of range.

Well. That's bad.

He looks around. It seems to be the house of some very rich person, judging by the carpet, the fact that the walls are colored and the general size of the room he's in.

"È permesso? (May I come in?)"

Well, technically he's already in, but proper form and everything.

...a face pokes out around the corner and yelps and says something in surprise!

He keeps is hands apart and far from his pouch in the universal "I'm not about to cast a spell" gesture (not that he needs the pouch but they probably have no way of telling him apart from a wizard).

That wasn't a language he recognized. The Mists must have brought him quite far.

"Do you speak Mordentish? Darkonese? 𝕯𝖗𝖆𝖈𝖔𝖓𝖎𝖈?"

The face says something! It's not in any of those.

He makes a gesture, stretching out his hand and miming touching: "May I cast Share Language on you?"

These people are rich, they're probably familiar with the spell name - it's standardized even across the Mists for this exact reason.

From the look of blank incomprehension, this guy might not be that rich, or that well-informed, or that within the Mists service area.

Another guy steps into view of the empty doorway between dining nook and living room. He says something quizzical.

So, on the one hand it's incredibly rude to cast a spell on someone who doesn't explicitly accept it.

On the other hand, Share Language is harmless and will make everything else that much easier.

On the mage hand, he has no clue where he is, and he has never seen their style of clothing and in general he feels quite lost.

Well, there is a thing he can do to get more information without needing to touch them. Hopeful they don't get startled, but they're most definitely not mages, and they're not armed, so it's probably fine.

Detect magic. Is there anything magical in the room? He'll look at... that huge black rectangle of vaguely reflective glass first.

There is no magic here, including in particular the big black rectangle.

Well, in that case.

He casts Share Language and then slowly walks towards... the first one who appeared, making it clear that he's going to touch him with a finger if they're not stopping him.

That one looks anxiously toward the other one for direction, but the other one doesn't know what's going on either!

Then he will get poked. As soon as the spell lands Reed takes a couple steps back and bows slightly.

"I am de Book, Reed de Book. I am incredibly sorry to have intruded into your home. I did not intend to, I was carried here by the Mists and well, we all know how they are."

"No we don't?" says This One incredulously.

No magic items, didn't recognize Share Language, weird clothes, not familiar with how the Mists work... where is he?

"I regret assuming more shared knowledge than we do have. May I know... where are we at the moment?"

"...you're in our house!" And then he breaks off from attending to Reed to answer a question from the other one in his own language.

"And I'm sorry for that. Would it help if we had this conversation outside instead?"

"How did you even get in here? We have an alarm system!"

"I was talking a walk to calm my mind when I inadvertently stepped into the Mists. When I got out of them, I found myself into your house. So I didn't technically get in here, which is why I suspect your Alarm didn't trigger."

"I don't know what the Mists are!"

"They are a mostly-impassable layer of fog around countries. If you step into them there is a good chance you'll wander aimlessly until you find yourself miles away. Occasionally, you'll find yourself on the other side of it, in the next country over. And sometimes... they'll just take you Somewhere Else. Someone speculates they have a mind of their own, but it's hard to learn much, especially when people who try investigate them tend to disappear for the obvious reason."

"That isn't a thing!!"

Slow blink.

"You seem to be distressed. Can I do something to make the conversation better for you? Would you rather not have it at all? I have some* more casts of Share Language - the spell I tagged you with that allows you to speak my language - and I could have this conversation with your associate if you'd prefer that."

* technically another 30ish but only if he did nothing else with his magic for the day.

"Brian is not excited about you having teleported into our house either! And - how can it have been an accident if you can also cast spells on purpose -"

"Well, I am sorcerer, but... I got distracted, and got transported here against my will. Would you like me to just... leave?