Is it just me or is the video gone? I do not see any video in the OP's post.
It's still there.
I found it on you tube. Looks like a conglomeration of tow items. Looks like a strap, cable, and chain not all chain. Chain itself does not store anywhere near that much energy along it. I have never seen a chain fly like that when it snaps...cable/rope/straps for sure not straight chain. Now that being said...snatch strap works so much better and does not tear things up so bad on your vehicle.