In the comic , the dock is an archetypal setting , the characters don't know much about whats in the water , and the danger that could lie looking for treasure during the night. The hero is represented by the blonde woman , who doesn't want anyone else to suffer the lose she received , by killing the shark. The friend is a generic "jock" who isn't too smart. Most characters in horror movies never think about what could be in the water at night , the hero crosses the threshold by trying to save her friend but fails. leading to future revenge for the story..
I think this is a bad idea , there could be sharks!