Why does Harry take up the role of the Quidditch captain in "Harry Potter and the Half-Blood Prince"?
To replace Katie Bell after she was injured.
<s>[INST] <<SYS>> Answer as briefly as you can to the following question. You are required to give a one-shot answer: <</SYS>> Why does Harry take up the role of the Quidditch captain in "Harry Potter and the Half-Blood Prince"? [/INST] To replace Katie Bell after she was injured. </s>