I recently watched a show on a channel about animals. So there a woman stroked the sharks on the nose and they calmed down, she could even twist them on all kinds of water, but they didn't care! Some people use it to carry out such medical examinations.
The answer is not very relevant, I just wanted to share!
A very interesting question) It's hard to say exactly. There are also options such as a blow to the gills, or eyes. That is, the nose is not the only place where you can harm a shark. Various experiments have been carried out with sharks, when they were beaten in the nose, then in the gills. And as experiments have shown, sharks really stopped their attack, but not for long. They returned to the victim for the next attack. Maybe some sharks were scared of it. But this remains open to question. There is another way to escape the shark - to pretend to be dead. In 1945, the American cruiser Indianapolis was sunk by a Japanese submarine in the Philippine Sea. It was alleged that some of the picked ones escaped sharks by pretending to be dead.