Sharks being fish, they need water flowing through their gills to breathe. Many fish can pump water through their gills regardless of their swimming speed, but most sharks need forward speed to generate that flow. It could be that Mr. Burns has shown us a really effective way to stop a shark attack. It can't do much if you wrap yourself around its tail... if you can only hang on. Way to go!
http://www.perthnow.com.au/news/western-australia/shark-attack-saviour-awarded-pride-of-australia-bravery-medal/story-e6frg13u-1226202952631
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