Surprising him? You mean like by a sudden rustling noise from the tree? Something heavy's landed on it. Shortly after the noise, a teenager starts climbing down the tree, looking at Hajime.

... There's something weird about this guy... an odd sense that fluffs his not-actually-there feathers. He wants to take a closer look, but something tells him this is a very bad idea. And he's learned to trust his instincts over the years... so he just smiles a half-smile at the guy.