As it was the last class on Friday afternoon, and many students were in a hurry to get home for the weekend.
Shen Yunsi glanced at her watch, feigning surprise as she spoke: "Oh, sorry, I didn't realize class was over. Let's go, I'll walk back to the classroom with you."
She stood up as she spoke.
"Okay," Yang Qian said, trailing a step behind her.
Shen intentionally walked slowly, a journey that would normally take three minutes took her six.
The loud classroom fell silent at her entry.
Shen Yunsi stepped on to the podium, grinning as she spoke: "Apologies for detaining you for an extra 20 minutes."
"It's fine, teacher."
She was sincere in her apology, and the students didn't mind, assuring her it was no big deal.