Kithabel is sitting on the flat top of the tallest tower of her palace, forcing the rain to decline to fall on her, taking a break insofar as she ever takes a break. She has no constructive ends to pursue right now, so she's playing with the lightning in the clouds overhead. She doesn't want to try taking a direct lightning strike yet - she could probably take it, but only probably - but she can tell it to arc here and there in patterns, she can ball it up and watch it roll through the air, she can make it turn colors. She's making sure none of it hits the town, and if it starts a fire in the woods she'll take care of it, but at the moment it's a toy.
This world is absurdly well-handled. Good job, I guess?"
The D-Hopper sparks, and the two of them are no longer levitating above Kithabel's tower but inside a dark room in a completely different one. They both fall a short distance to a wood floor. "Not again!"
"You'll what? What's the matter?" Skeeve telekinetically opens a window for light. It provides little, it apparently being night here, but there is a clearly visible single moon.
"My momentum is gone. It's all gone! I should be able to make light even if I spent a week on fucking vacation! You life-destroying bastard what did you do to me? It's all gone, years of work, I just fucking learned to fly and it's gone what the fuck did I ever do to you it's gone it's gone it's gone!"
Someone knocks on the outside of the door, and a voice says "All right, who's in here and what's going on. Some of us are trying to sleep, and the walls here aren't as soundproofed as they ought to be."
"You didn't tell me it might zap me to locales unknown!" hisses Kithabel. "Or activate without any prompting as opposed to merely incorrectly! And now who knows where we are and I don't have any magic not a speck!" She is a little too pissed off to pay attention to the knocking.
"Well, now I'm awake. You claiming to be magic? That's one thing, but claiming to have just lost it puts you in a minority of one."
"I was a sorceress until this idiot with his malfunctioning device didn't warn me that it would grab extra passengers and dropped me here and took all my momentum," snarls Kithabel, pointing at Skeeve.
"The idiot—alleged idiot—didn't know it was going to do that, any more than he knew dimension-hopping could take her powers!" Skeeve yells back. Whether any of this makes sense to the newcomer is not his priority right now. "It never did that to any magician I've ever heard of before!"
"I was a sorceress not a magician I explained how it works to you it obviously doesn't work like that anywhere else!"
The newcomer catches some of this, puts two and two together, and says "sorry to change the subject, but I think I'm going to need to see that device. You say it can transport people across dimensions?"
"Yes, but not very reliably. And apparently sometimes with unintended side effects that nobody could possibly have foreseen."
"Sorcery exists in one world! You knew that it was different everywhere else! If momentum could exist somewhere else don't you think it would!?" Pause. "That is the only dimensional teleporter handy. I want to go home. You mustn't break it."
No way I can figure this out." He hands it back to Skeeve.
"All right, who are you people? My name's Hank, better known as The Boss."
"Oh, you're some of those people. The dimension-hopping story was promising, but I've dealt with enough professional magic-users to know how much credibility they have."
"His magic should still work. I saw him fly, and whatever he was and must still be doing to translate, and he kept the rain off him like I did, and I want lessons instantly because I will be damned if I do without magic for the rest of my sorcerously unaided lifespan."
I'd rather poke this thing until it works again, and get this fiasco over with."
Skeeve is surreptitiously dripping with rainwater from Kithabel's world. It's an unusual activity for someone who looks completely dry.
"I thought you were keeping the rain off you, anyway," she says, peering at the puddle. "I'll calm down soon enough and I do actually believe you that you didn't put two and two together about leaving wrecking my momentum. I'm good at self-teaching, anyway, if you start with a basic explanation I shouldn't trouble you very much about it. I'll be just as willing to skip it if you can get me home, but it doesn't seem like that thing works usably."
"It works. I use it. Granted, I use it to get to appointments I'm anxious to miss, but still. I have every confidence it will get you home. Eventually."
"Well, as long as you're here, you're kind of my problem. Either of you planning to go around claiming to be magicians or do any public shows?"