Absolutely.
I was a marine biology major and spent years studying sharks, and one of the things that came through loud and clear in studying unprovoked attacks on humans is that, the minute you spot a shark, and it knows it has been spotted, your chances of attack have just plummeted.
They, like most predators, prefer surprise attacks, in their case usually from below and behind, because they want an easy kill.
Just by paying attention, in any number of possible scenarios, it can not only save your own life, but potentially someone else's as well.
RE: The Masculine Principle - The Right to Self-Defense