C1258 Noncompliance
Falling Stones was an idiom, an idiom from a world where Chen Hui came to visit.
Originally, he had intended to throw a stone to see if there was any reaction before sneaking into a place at night to probe the situation.
Then we use this idiom to probe.
If what Jiu Yan said was true, then Chen Hui was the stone that was thrown out to probe, and the one who threw out the stone was Su Yin