Bumping into sharks: knock-down tips

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Off Hawaiian coast a surfer recently won in a one-to-one battle with…a shark. As he was lying on his board waiting for an ocean wave to arrive, he accidentally spotted a shark fin popping out of the water and swiftly approaching him. Several kicks were enough to hit the shark’s eye, get safely on the surf board and reach the shore. Would you act with an equal self-control?