Spritely Sam would be fascinated to hear about the borrowers!
People just like him that live close to the humans? It’s like wraith sprites, only these would be his people without the quills! Sam would have so many questions– How do they survive, where do they get the supplies from, how have they gone unnoticed for this long???
Walt would be scratching his head, especially when he finds out that this kid grew up in the sunlight, out in the forest. It sounds so unprotected! So… open. His back itches to think about no ceiling over his head.
Also, Sam would have terrible nightvision, so he’d end up quite lost in the walls if Walt was showing him around.