I would crap myself if this happened to me, GoPro: Man Fights Off Great White Shark In Sydney Harbour

This is the latest popular clip I have seen and it made my heart race just watching this.
I would crap myself if this happened to me.
It is obvious that this great white was not hungry else they this guy would have been chow.

https://www.youtube.com/watch?v=-m3N_BnVdOI