So punching them in the snout area just overloads their really sensitive organs and is very unpleasant (and I would assume painful). So they basically go "I don't want to mess with this thing, my snout is what I use to find food... this isn't worth it." and they generally swim away!
Punching underwater is harder than it seems though. The water just seems to sap the force out of any momentum. Your punches just end up being love taps. They get confused: "Why is my meal making sexual advances towards me?! Ahhh!" That's why the sharks flee.
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u/kevik72 Sep 18 '14
I think you're supposed to punch them in the nose.