User blog comment:Kogath/Monster Hunter 4 Ultimate for the Nintendo 3DS/@comment-8874090-20150215171407/@comment-25119729-20150215175004

So Iooked up that water thing and I found a surprise. Maybe the reason for Tetsucabras weakness is water intoxication. Basically, you force so much water into it, that through the process of osmosis, its brain cells start to swell. They can even swell so much, that these cells begin to apply pressure to the brain as a whole and can even cute out the blood flow to the brain. Since amphibians have usually very thin skin in order to absorb water with it, as well as oxygen, it should be really easy to force water into it by hitting it with water elemental weapons. I hope that answers atleast that question.