the ocean is a dangerous place

It's their home, what did he expect. It's like seeing a bird in the sky and freaking out. Of course most birds can't eat you, but still.

Is that a skeleton? Sorry I don't see it clearly >.<

It was a fake photo though.

Damm nature, you scary!!

this is the feeling you got when you were in the pool alone at a young age

See my issue with this kind or thing is that sharks are generally like: 'thing shaped like food, don't know if it's edible, better try'
Then they will bite something, a limb probably, and then realize their mistake and swim away. They're not actively trying to kill us in particular, they're just curious and trying to test with their mouths.
Shark attacks are rarely leathal. More people in the U.S were killed by pigs last year than sharks worldwide.