"Yeah! A fun puddle!" To explain what she meant, Yotsuba moves out of the safety of Vexen's umbrella and steps into the middle of the large puddle. There, she lifts her feet and stomps heavily into it -- jumping up and down once for good measure.

If he notices, he'll see that every step she takes -- every jump produces rather large splashes that sometimes reach past her shorts.

When she's done, she goes back over to him and points to another puddle, "See! Fun puddle!"