I’m pretty sure it’s firmly in ‘fear of being killed by a shark’ territory.

Fair enough. Still, I feel these people have too little experience with the ocean. Of all the shark species, very few would actually be able to eat a person. Of course, the rest aren’t exactly harmless. The teeth of a sand shark for instance are too small to do much damage to the skin. Their jaws on the other hand, are so strong they don’t just break bones, they pulverize them. That’s sure to ruin your day. But you won’t end up dead or eaten.
The real creatures you have to look out for, are wild dolphins. Those fuckers are nasty. (sharks fear dolphins)

It’s when I turn calm and quiet that it’s time to worry

Ah yes, rage-zen is an amazing state. Something to behold. Preferably from a good distance and behind safety glass.