The order from Berlin caused a strange quietness and sadness in the school that day. This can be explained by the following factors:

1. Sudden Change: The order from Berlin brought about a sudden change in the school routine and atmosphere. This change was unexpected and disrupted the normal flow of activities, leading to a sense of unease and confusion among the students and staff.

2. Uncertainty and Fear: The order may have contained directives that created an atmosphere of uncertainty and fear. It is possible that the order conveyed news of a tragedy or an upcoming event that could potentially harm the students or the school. The lack of information and clarity would have contributed to the feelings of sadness and apprehension.

3. Impact on Teachers: Teachers, who are responsible for the well-being and education of their students, would have been deeply affected by the order. They may have been aware of the potential consequences and felt a sense of helplessness in protecting their students. This emotional burden would have contributed to their sadness.

4. Emotional Connection: Schools are not just places of learning but also communities where students and teachers form emotional bonds. The sudden change brought about by the order would have disrupted these connections, leading to a palpable sense of sadness and loss among the school members.

5. Absence of Hustle-Bustle: The hustle-bustle that is normally associated with a school day, such as the chatter of students, the movement between classes, and the general liveliness, would have been conspicuously absent. The silence and stillness that replaced the usual activity would have added to the atmosphere of sadness and unease.

6. Impact on Students: The students, who are accustomed to a structured routine, would have been disoriented and upset by the sudden change. They may have been aware of the seriousness of the situation through the reactions of their teachers and fellow students, further contributing to the overall sadness in the school.

In summary, the order from Berlin caused a strange quietness and sadness in the school that day due to the sudden change, uncertainty, fear, emotional connection, and the impact on teachers and students.