Whatever Vash was trying to trap has been trapped! But older Vash doesn't pay it any heed, not when younger Vash is pointing at him like that! It's a good thing he speaks Garble, and can tell that the sounds Vash is making are surprise and not something worse -- anger, accusations, blind panic.

His hand still over his mouth -- are they still being quiet for the trap? -- Vash nods, and waves his free hand in a little wave. Hello! Check out the mole! The lovely, once-blond locks! The pretty eyes! He's you, kiddo!

There's a scraping sound from the other side of the rocks, and Vash, hand still over his mouth, points inquisitively in that direction. Do you want to do something about that, friend? Your, uh, lunch is getting away.