I kited with a pod of 4 or 5 orcas this summer. At first it was "hey, cool, whales!", riding toeside watching them approach upwind. Had by gopro in the truck, doh.
Then the wind started dying a little, so I headed a little closer to shore with each tack, and realized they were never getting any farther away. The wind was sketchy enough by this point that there was risk on turns of ending up in the water. I started wondering what the possibility was they were transients (seal eaters), especially the one big bull. So headed in direct to shore ... and by this time, no question they were following me! They stopped about 50m from shore ... much to the amusement of all the other kiters on shore watching.
Seriously doubt anything would have happened, as they are almost definitely salmon-eating resident orcas, probably just curious. But had a "welcome to the food chain" thought for a few moments there.