To guard against Su Yunjin deceiving her.
The old woman still pointed a hairpin at Su Yunjin's belly.
Unless Su Yunjin told her the secret recipe, she would not remove the hairpin. Su Yunjin was not someone to be trifled with. She scoffed, "Granny, I have agreed to tell you the secret recipe for having a son. Is it not time for you to put away your hairpin?" Su Yunjin said this as she spoke.
At the same time, she grabbed the old woman's hand that was holding the hairpin. Su Yunjin, skilled in medical knowledge, knew the human body's acupoints. She accurately found the tingling acupoint on the old woman's hand and pinched it hard. The old woman's hand went numb, and the hairpin dropped to the ground with a clatter.
Just then, Gu Ya, who had been to the town, returned and saw the scene in the courtyard from afar. He instinctively wanted to call out to his wife but realized something was amiss.