Dick's first reaction is to tilt his head and give her a confused look. Like - how do you explain something you just know?

But when they get to the tent, he's demonstrating the tightness of the guys, and showing exactly how rigid the poles are. He points out the guy pegs ("Fry measured these out precisely") and cartwheels between them (Without even thinking that he might touch one of the ropes).

The sides are currently rolled for the day, but he points out the pegs that will peg them down at night.

"Not everyone'd done this before but I showed them how to drive a peg with a mallet and everyone picked it up really fast."