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Because of its high-pressure body structure, it sucks in the water through his legs. Kinda how skin absorbs sun light, actually.
Since it can also stretch his arms and legs out, it is a good way to deal with temperature. The wider he stretches, the more heat he can get out thanks to the spring-mechanic in his arms and legs.
So we know his cool-off technique and how he absorbs water quickly and effectively.
Two very important factors for a fighter who does a lot of activities.
One can say that, to minimize any potential damage, he doesn't have an actual mouth, and the nosdrils are basically the huge eyelids in order to get the air directly and more effective in the brain.
An actual nose or mouth hurt him in the long run as well, because his stretchy legs may hinder him more in the end.
We know that his arms are weaker, but because of its design... seem to have springs as well to be used for the above mentioned factors. Why can his arm springs not be his mouth as well?
Since the legs reach the arms, so that hand + legs can protect it very well, it would make sense for the mouths / teeth to be placed there.
As a skinny, highly dynamic animal you will not need too much raw meat anyways.