THANKYOU! Someone finally brought up the fact that the guy was training with a group!

So there are several facts missing from this equation.

Yes sharks do primarily feed at dusk and dawn, but that really only applies to the shark types that feed inshore and come in with the bait fish. Also, a high percentage (something like 95%)of shark attacks occur within 5 ft of water and are caused by what amounts to a feeding respose by the shark as they chase after bait fish. Great Whites primarily feed on seals and sea lions(which feed during the day). Great Whites are also deep water feeders. So right there with those two facts, Great Whites do not apply to the standard shark stats.

Great Whites select their prey by looking up at the shadows on the surface. They like to attack from underneath. If this man was swimming with a group, and since I am guessing the water is pretty cold, lets assume they were in wet suits, they would have looked like a school of seals / sealions. The sharks primary prey. Why was this man attacked over the others? For what ever reason, he probably appeared to be the weakest of the group. Maybe he was straggling behind and seperated a little....who knows.

At any rate, it is quite ignorant to believe such a statement that sharks feed at dusk and dawn would apply to all species of shark. You MUST take into account the type species that did the attacking. It does not matter what time of the day that guy was in the water since it was a great white involved.