The upper and lower sentences are each an allusion:
Parrot misrepresented the name of a drum official: Mi Heng Dian, which was written as Parrot Fu at the end of the Han Dynasty, scolded Cao and was finally killed by Huang Zu, which is a metaphor for the unfortunate experience of a talent born in troubled times.
Mantis mistakenly entered the pianist's finger: this sentence means that Yan used to smell the sound of war when playing the piano, which means that she will stay in danger for the rest of her life and save the day. See the explanation below for specific allusions.
In the Eastern Han Dynasty, Cai Yong used paulownia wood with burnt marks at one end to make a piano with beautiful timbre. Can you check the allusions to Qin in the later Han Dynasty? Biography of Cai Yong. I followed the map and extracted a passage from the Biography of Cai Yong: "When Tan stayed, someone in his neighborhood called Tan with wine and food, which was more generous than going to the Lord." When the guest is playing the piano on the screen, he goes to the door and tries to listen, saying,' What's the point of making me happy and killing my heart'? And then return. Tell the host that Cai Jun always answers the door. Su Yong was ruled by a great elephant. The master asked him why. It is a shame to be warned. The pianist said,' I played the strings and saw cicadas singing in the direction of mantis. The cicada is leaving, but it is not flying. Mantis was the first one, but my heart was shocked for fear that mantis would get lost. Is this to kill the heart and form it in the sound? However, Wan Yong said with a smile, "That's enough". This sentence makes Yan smell the sound of war while playing the piano with Cai Bojie, which means that she will escape from danger for the rest of her life.