That'll net him a startled yelp and stare. They're perfectly still until he sets them down, and then they lean back against the trunk of the tree. Sure, they're used to falling, but an adrenaline spike like that still leaves their legs jelly.

"Oh. You're Underground. From," Frisk says blankly, the effort of straightening their thoughts out obvious on their face. They weren't entirely sure, what with Batman and stuff. He's nothing like they've seen before.

"...I fall a lot," they tell him matter-of-factly. "And I'm practicing climbing, so I might more. But, yeah, I'll try to be."