"How fast are you?" Cayde asks as he eyes the water and the fish scooting about within. "Let's see how you do."

He leans over closer with the kid. Does he think this method will work? Well, he's willing to give the little guy the benefit of the doubt. Maybe the Mando doesn't even go fishing. He probably shoots them. ...which doesn't seem like a terrible idea to Cayde, but in this instance probably not at all practical.