This is 100% an entry point Wrench uses with reluctant signers to win them over. "Hey, how's about a communication method that we can use underwater? From 200 feet apart? Silently, while we're tracking a deer? (Or maybe being hunted ourselves?). Super-secretly so no one else knows what we're saying? Boy have I got a solution for you!!"

He will at least teach Bucky signs to made quiet sniping commentary at people who won't move their seats up in small cars.