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Sputnik11 said..
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Guessing it wasn't a dolphin, they're too professional to make contact.....

I've seen lots of dolphins up close in recent years. They all have lots of scars down their backs. Some you can see they have a series of propellor slices in a row.
I think they scratch their backs on the hulls of boats while they're fanging along and sometimes get it wrong.
Dolphins might be very intelligent, but in human terms they're probably as smart as the average surf grommet. They live a similar lifestyle. Surfing, Eating. Rooting. I wonder if dolphins get stoned?