Earlier quoted context omitted.
Attacks on humans by Orcas happens. Its that they do not eat humans, once they realize its us, they let go and swim away. They need to taste us first, especially if none of the members of group haven't tasted or interacted with humans before.
Same with most sharks. They have to bite you to know what you are, most shark attacks are quick strikes and then they let the victim go.
Seems like we might not be very palatable for many creatures (or are just too bizarre for them to eat).