I was just thinking about adding some latex surgical tubing to my field kit. Adventure racers will use a 10' section to pull slower team members while racing. It's also useful for getting water out of your solar still without unsealing it. But now I'm thinking a slingshot would probably be the most utilitarian use for it.
The reason this guy doesn't aim is because he's been doing it since he was a child and probably has done it so much without aiming that he has the neural pathways down to do it that way from a young age... but he is good I've never heard of someone like that who can use a slingshot