yes they would eat dolphins and walruses or whales if they lived today. if you had a knife, then if you were sucked into that mouth, chances are you would not be grazed by it's teeth since it's mouth is so cavernous.
if you could hold on to it's epiglottis or something on you way to it's gut, you maybe could carve your way out it's side. as long as you did not get swept into the acid environment of it's stomach. that is an immature imagination.
no human could hold on in the face of the muscular power of their peristalsis of swallowing you.
i know that a human is nothing but a tid bit to them. really, it would just swipe you up like a dog snaps at a fly if it was that close to you.
white pointers like seals, and wetsuited divers remind them of seals, but humans are very skinny compared to seals.
they never the less take a bite to see, and the blood spill usually sends them crazy.
sometimes they unexpectedly just swim away, but i think that is because they notice other danger approaching then (like surf ski motors) etc, and that the blood cloud did not enter their nostrils before they fled.
white pointers do not spend energy hunting humans because it is not worth it to them, but if there is a person flailing on a surfboard, then they may as well take the morsel on their way to the seals they are really looking for.
if you are a silly person on your way to a restaurant for lunch, and you smell a street demo of say quail legs being cooked up and given to the public in a promotion, then if the spruiker offers me a sample i will partake.
even though i am on my way to a full meal, i will still take an easy bite on the way.
the thing that is kind of sad is that even as big as they were, humans could easily kill them if they lived now (with artillery shells from a coastguard cruiser even).
so the lack of intelligence in their minds, renders their super physical prowess futile compared to the species that the fragile little surfer comes from.
i see innocence in the sharks eyes.
i also see complete insensitivity and i am fearful of that look.
but they can not come onto land to hurt me, but my race can go to the water in big ships, safe from them if they lived now.