Pretty cool. The shark's weakness is it has to keep swimming to respire. The octopus would only have to hang on for a few minutes to suffocate it. I wonder if giant squids give great whites the same trouble?
the only shocking part was it praying on the sharks. Not suprising to me a giant octopus with long suction tenticles can wrap up a shark helpless. I guess to the octopus they were just another fish.