Because almost all the rules mentioned "safety," but most of that "safety" was a superficial reassurance. Only the "safety" of the Dormitory could be called absolute safety, allowing even someone with inspiration as high as his to sleep peacefully.
"So, to obtain this 'absolute safety,' Head Teacher 040 was willing to have us take a huge risk by going back?"
"The Teaching Building is safe, but... some danger that exceeds the protection of the Teaching Building Rules seems to be approaching."
Did this danger supersede the rules?
Not necessarily.
Then had the rules come into conflict?
Not necessarily.
Based on the rules he had seen earlier, Lin Yi suspected that this bout of abnormal weather had very likely caused some kind of emergency, triggering a higher-priority rule.
He speculated that the Head Teacher Rules might contain a rule along the lines of [If a certain situation arises, please have the Experience Students prioritize following the "emergency response plan," and do such and such].
Simply put, Head Teacher 040 had hinted that a higher-priority rule they knew nothing about conflicted with the rule in their Student Rules requiring them to [reach the nearest building for shelter at all costs when encountering abnormal weather], and they could choose to trust her and follow this rule.
It looked like a very simple choice.
One of two options-no, actually, one of four.
The Head Teacher had announced the question, hinted at the circumstances, provided the options, and told them the answer.
All they needed to do was follow the steps.
Just as Head Teacher 039 had done before locking the classroom during Evening Self-Study, Head Teacher 040 had also offered a round of advice. The difference was that Head Teacher 040 had specifically given those with high inspiration... or some other classification, another option.