The other thing about sting rays is that they can only sting someone deliberately if they are lying flat on the bottom of the ocean. They need the leverage in order to flip that tail up. Guides in the Cayman's tell everyone NOT to jump up and down....which most do anyway.
The incident above had to have been a total freak accident. I used to be terrified of rays. When we went on the excursion, I did NOT want to get into the water...it was full of sting rays. (DUH)
Hubby shamed me into it and I loved it. They were so gentle. He bought me a stuffed one later that day to commemorate my overcoming my fears. It was a truly awesome experience. His name is Sparky and is the only stuffed critter I have ever been really attached to...and at my age.