Such a faint sound, logically speaking, would absolutely not be heard from outside through a pile of dirt.
But Chiang Xiao heard it!
The steps she was about to take suddenly halted.
Stunned for a moment, she fiercely turned around and threw herself onto the pile of dirt, shouting loudly, "Brother Xinian! Is that you?"
Is it him?
Is it Meng Xinian?
No sound.
No response.
Chiang Xiao called out again, "Brother Xinian! If it's you, scratch once more!"
After shouting that sentence and waiting for quite a while, she finally heard the same extremely faint metal scratching sound as before.
It really was him!
Chiang Xiao leapt up.
"Brother Xinian, you must hold on! I'm coming to rescue you right away!"
Behind the door, Meng Xinian's hand loosened, and the small knife dropped to the ground; his fingers slackened, no longer having the strength to do anything.