Birds of prey will strike, fly low and gather their wings
Bird of prey will attack, fly low and gather wings is a Chinese idiom, which means to mean to play hard to get and wait for an opportunity.
source
"Six Taos · FA Qi" says: "birds of prey will attack, fly low and gather wings; beasts will fight, and fall with their ears."
Examples
Good brother, and don't let your nature be angry. Wumingshi's the story of Ming Feng
Birds of prey will strike, fly low and gather their wings
a small hole which just allows the head and the body of an animal to pass - róng tóu guò shēn
Holding ice in winter and holding fire in summer - dōng hán bào bīng,xià rè wò huǒ