I wonder if a grenade or m-80 would scare them off?
Or maybe just piss them off more? One thing you don’t want is an angry orca!
All kidding aside, this is really weird. We have plenty of Orcas swimming up and down the California coast, and while they’re generally not as curiously gregarious as dolphins, they do occasionally match pace and check out sailboats. After several decades I’ve never seen a hint of aggression towards a boat, though you wouldn’t want to get in the water when they’re hanging around. People look way too much like seals when in the ocean, IMHO.