Sharks a rarely THAT bad.
I bumped into a 13 foot Tiger Shark in Hawaii, when I taught diving down there. We literally bumped nose to nose. I turned and swam off, and so did he.
I have been in open water with makos, hammer heads, port beagles and blues. Blue to me were the most scary, because they tend to nip at you, just to see if you are tasty. If they get you bleeding, then everyone wants a go.
Also had a job feeding sharks for a bit - in the Med. There were two species there that I swear were dangerously smart. Bronze Whalers and Oceanic white tips. Even though you had a big bag of food, and a feeding pole..you alwasy kept an eye on those things...and they were the only sharks you ever really had to "armour" up your gear for. We would use flexible underground electrical condiut to put over our regulator houses because the Bronzies were particulalrily facinated with severing them.
Ahhh..the days of fun.
I would love to see a local salmon shark at work! Underwater that is. And preferably not working on my leg.