I think there is a lot of hooey about sharks among the diving community; it's obvious we are not considered fine cuisine among fish with teeth but it's absurd to think a GW won't eat you if he is particularly hungry,or just in a mood swing; some attacks are suprise and some are not; you can mount some defense by striking at the GWs eyes (usually your torso is in his mouth at this point however, hmmm), attacking a shark to scare him off seems to make sense with other sharks, bulls, white tips etc. but I would question that approach with GWs, which appear to be fearless., 2+ ton dinosaurs. Often a GW bites and leaves you to bleed to death (sometimes to come back) so often you have a chance to get out of the water (that does not include people who get their heads bit off however). I do believe they smell your adrenaline (fear) so stand fearless in front of those gaping teeth (hah), luckily for some of you crapping your pants won't make a difference either way. Hope this helps!
PS There are no shark ex spurts zeN||