In Call It Courage, what makes Mafatu overcome his fear of the shark?
The answer to this can be found midway through Chapter 4. Mafatu overcomes his fear of the shark out of his love for his dog.
Mafatu and Uri are on the raft and Mafatu sees the shark destroy the fish trap he worked so hard to make. He is filled with rage at the shark but cannot do anything about it. But then a wave dumps Uri into the water and the shark comes back to eat Uri. Mafatu can't let that happen to the dog he loves so much so he dives in and ends up killing the shark.
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