I think a dolphin can hold its breath longer than a human, and not to sure what the vulnerable spots are on a dolphin. I guess the human can try to block the blow hole and keep the dolphins snout closed, but then all the dolphin would have to do would be to dive down, so I think the dolphin, because as soon as that human let go to swim to the surface for air, the dolphin would charge him and knock the wind out of the human while he was still submerged. So Dolphin, unless human gets very lucky and finds a soft spot.
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