I saw this some time ago and wondered if the guys did this to try and claim new tubes on the insurance, it clearly shows they were trying to get a reaction from the shark.
Ive spent years with toothy sharks and I know inflatables and teeth don't mix, even without burley in the water they are attracted to the electrical field from anodes on engines. My other boat non rib has teeth and tail marks from the prop to the cowling, not a good look on a 3yr old Suzuki.
Jon
This is the mako which tried to eat my engine