Reminds me of common belief that dolphins push drowning people to the shore. It's hard to check if it's actually true, after all, most people pushed in opposite direction are most likely dead.
There was an article about this in the paper recently, specifically about dolphins protecting swimmers from sharks. The scientist said, dolphins are curious about you because you're warm-blooded like they are. They usually have their kids with them, so they will make sure the area is shark-free for that reason. If you don't get rescued before the dolphins get bored, they'll leave you to the sharks without a second's thought...
