Can you keep a secret
Okay, let's go again.
The fisherman saw a shark and stuck him with is fishing sword, the shark happens to be the mother shark which birth all the fishes in the sea, this angered the mermaid and she got really mad and struck the fisherman with lightning, it wasn't on purpose but before she could stop herself the fisherman was dead!
Yes, that's it.
I won!!!
The answer is the MERMAID, I shouted happily. Ahhh!! Now I can feel a little ease, nobody is going to die.