Canonically, cats aren't very fond of witchers-- though there are exceptions -- and witchers are generally wary of cats! I think it would be fun to build on their interactions from pre-vampire shenanigans (which already feels so long ago, hard to believe it's been two?! weeks?!) and have them run into each other.

Having said that, since they didn't have an opportunity to thead anything out during hell log, do you want to handwave anything there or do something in the aftermath log side of things as a prelude to Alolan adventures? I can roll with anything, just figured I'd toss the option out there!