Save the day, use the right place to burn what?

Take advantage of the east wind to burn Chibi.

Zhuge Liang (word Kong Ming) offered sacrifices to the wind at the Seven Star Terrace, and Zhou Gongjin's metaphor was very timely.

Burning Red Cliff means exchanging a small amount of sacrifice for great victory, which is a superb metaphor.

"Taking advantage of the east wind to burn Chibi" is an important story in The Romance of the Three Kingdoms. The synopsis of the story: At the end of the Eastern Han Dynasty, Sun and Liu joined forces to resist Cao, and Zhuge Liang took advantage of the east wind to help Zhou Yu burn Chibi, defeating Cao's 8, troops and winning the victory in Battle of Red Cliffs.

this sentence is used to describe that when solving problems, you can use external forces flexibly to solve problems, and you are not rigid in doing things; Metaphor is superb.