Sethos knows you're a little. It's not like he's stalking you or anything! He just has that... Tendency to be in the right places at the right time to learn stuff about everybody. So it's not like it's specific to you.

Actually witnessing you regressing is entirely different. He didn't think that you'd get this upset over something so small. Maybe a bunch of lil things were building up but only a few books fell from the shelf.

"Hey, hey, what's up, pup? Do you need a break?" Sethos asks softly, kneeling down next to you.