Why does Harry first encounter thestrals in "Harry Potter and the Order of the Phoenix"?
Because he has witnessed death.
<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 first encounter thestrals in "Harry Potter and the Order of the Phoenix"? [/INST] Because he has witnessed death. </s>