The complete video is here, or at least it was there when I looked at it, don't know if it will stay up.
https://www.reddit.com/r/CrazyFuckin..._jumped_off_a/
It's dark as fuck. It seems like a drunk off your ass party. You can barely see a guy in the water. I see no sharks, but it's the ocean so there are sharks.
People automatically think just because there are sharks in the water you're going to get eaten. If you get in the shallow water at the beach there's a good chance there's a shark in there with you if you are in FL or tropical waters. They don't normally bite. Usually they bite because they think humans are something else, or we are disturbing them.
I would be more concerned with him swimming towards the back of the boat where the engines are.