As for whether Nan Zhubin remembered correctly, both consultants felt it was unimportant.
The number of codes Nan Zhubin provided could be counted on two hands. Eliminating data represented by these codes has little impact on the overall data.
If the questionnaires Nan Zhubin reported were indeed invalid, removing them might slightly enhance reliability and validity;
but if Nan Zhubin remembered incorrectly, mistaking some valid questionnaires for invalid ones, leading to the removal of valid data—it doesn't matter. Given today's data collection volume, losing a few valid data points doesn't affect the overall progress.
The two young consultants merely felt that Teacher Nan hadn't done much work today and was now venting his excess energy on unimportant details.
They didn't find it odd, and even felt a peculiar sense of relaxation.
Keep in mind, they were the same age as Nan Zhubin—or maybe even slightly older—but had always been overshadowed by Nan Zhubin on various levels.
