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Pi was appalled at the sight of the hyena eating the zebra's leg and was angry (briefly). He had too many other things to worry about to deal with the hyena.
"Shock and anger surged through Pi. He wanted to get revenge for the zebra against the hyena, and thought about killing it. But the anger was short-lived. Pi didn't have the pity to spare long for the zebra, he had his own problems to worry about, which were hard enough. He is somewhat mad at himself for not having empathy for the zebra. It's not something he felt proud about; every day he prays while thinking about it."
Life of Pi/ Chapter 45