The men might have been a bit unnerved, but if so they had nothing to worry about. Though orcas are fierce carnivores, and often come into contact with people, there is no known case of a wild orca killing a human.
Much more likely, the intelligent animals were just coming over to say hi - and have a bit of fun. Naomi Rose, a marine biologist with the Animal Welfare Institute, told The Dodo last year that some orcas just get a kick out of cruising along in a boat's wake.
"This is a common behavior in certain places - the whales I studied in British Columbia, Canada, did this," Rose said. "It's called wake-riding and they are doing it for fun. They are literally surfing - they can go very fast with very little effort when riding in the wake of a boat like this."
And these orcas got to have double the fun. They got in some surfing - and totally psyched out the people.