Okay, this dolphin thing should not a big deal. If you are feeding animals by hand and they might occasionally nip you in the process. I have seen horses do worse. Would this be a story if a dog or a cat did the same thing? If you are doing something like this you have to realize that you might get bit. I am not a big fan of keeping captive dolphins and orcas for entertainment anyway.
In a related story, here is a pod of wild orcas catching the attention of a free diver and a labrador retriever in New Zealand. This is not really an attack but an event you would want to take seriously.