Everything he said during our encounter was repeated; instinctively, I did the same. (Para. 4)
Meaning: During our encounter, he said everything twice and by instinct, I said everything twice too.
instinctively: ad. without thinking and without having been taught
When attacked, he instinctively fought back to defend himself. 遭到袭击时，他本能地回击以保护自己。
instinct: n. natural habit of behaving in a particular way, without thinking and without having been taught
mothering instinct母亲的天性
language instinct语言的本能
pain-escaping instinct 逃避疼痛的本性