弩下逃箭

Explanation: Metaphor from the past who can counter-disaster calamity. Bolt shot by shot far past, so it is this metaphor. 　　Source: Song Wenying "Xiang mountain record" Volume down: "If this was my one hide, then off Rubei several of the disaster, and then found near the million people without reason, so-called 'escape crossbow arrow under' also."