Curiously, I relate to both. I have a certain degree of fear or trepidation of sharks when swimming in the ocean. I feel vulnerable, and keep imagining a shark coming up under me or behind me. But I’m also a certified diver and have exactly none of those fears when diving or snorkeling! I think it’s because I have reduced awareness of what’s around me when swimming in the surface. In a sense it’s coming from the same place as a fear of the dark.