Summarize the battle between Richard Parker and the shark

The sharks are always around, but never do anything that really threatens Pi, and so he grows to like them. One day he manages to pull a smaller shark into the boat, where it gets into a battle with Richard Parker,

Richard Parker turned and started clawing the shark's head with his free front paw and biting it with his jaws, while his rear legs began tearing at its stomach and back.....Richard Parker's snarling was simply terrifying.