"You're not bad either!"
"I'm far from it, I can't compare to you, Third Senior Sister," Lin Yifan humbly replied.
"No need to be humble, you're already impressive. In the same realm, I almost couldn't beat you."
Third Senior Sister comforted Lin Yifan's hurt little heart, urging him not to be so discouraged.
"Senior Sister is being modest; against Junior Brother, more than enough."
"Ah! It's Junior Brother who is being humble."
"It's Senior Sister who is being humble."
...
The two continued to be modest back and forth, enjoying themselves.
The disciples from Medicinal Saint Valley were also bewildered, not understanding why they kept humbling each other. They won, so just admit it; they lost, so there's no need for all the talk.
Lin Yifan felt that this wasn't a good solution, so he changed the topic, using the opportunity to slip away: "Senior Sister, I am unworthy and need to go back to train more. Do you have any other instructions?"