A slow arrow leaves the string
It's a Chinese idiom. Pinyin is n ǔ Ji à NL í Xi á n, which means very fast. It comes from the orphan of Zhao family by Ji Junxiang of Yuan Dynasty.
The origin of Idioms
The first fold of Zhao's orphan written by Ji Junxiang in Yuan Dynasty: "if I take you to go, it's like an arrow leaving the string; if I call you back, it's like a feather on the carpet."
Idiom explanation
The metaphor is very fast.
A slow arrow leaves the string
the footprints leading to a certain point and from these onwards the traces left behind - lái zōng qù jì
take possession of the sea monster 's head - áo tóu dú zhàn
be hard to refuse for the sake of friendship - qíng miàn nán què