It wasn't hurting but it certainly was leaving him confused! Reactor? That sounded quite a bit like Muggle technology more than anything Wizarding. His brow pinched together harder as he listened, but then the last bit really shot up them both in surprise. Was Vrenille just... such a low level wizard, from another country, that he knew none of what Remus was talking about? Terms varied by country, that much he knew well enough, even if he didn't particularly know what any of them were, but this felt like they were speaking two different languages all together. So, cautiously, he decided to try another approach.

"...I... I don't mean to make you feel ignorant," Remus said, an honest sympathy and concern in his voice. Hurting people, in any way, was the last thing he wanted to do. "It's more likely me who's ignorant, given that no matter where you go in the world they all know different things and have different ways of handling magic and wizards. So... let's try this instead? Why don't we go get breakfast and over it, you can tell me more about your part of the world?" That way, they could try and find some common ground to work on over a decent meal, then go looking for this map Vrenille wanted so badly. Madam Rosemerta would usually give him a bit of a break and let him work off meals if he needed to, so he already had in mind where they would go.