I'll expand this to 1200 words, maintaining your starting and ending points:
The next day, which was a Saturday, there was no class. There had been an announcement that there would be no class that particular day. The superiors were still deciding and planning on how exactly they were going to go about training the students. They had already decided that they would focus on combat mainly, but they were contemplating on how they would go about it.
The announcement had come late Friday evening, delivered through the school's intercom system with an urgency that made everyone pause in their tracks. Students had exchanged confused glances in the hallways, whispers spreading like wildfire through the dormitories. Some felt relieved at the unexpected break, while others sensed the gravity behind the decision. This wasn't a holiday or a celebration. This was preparation for something far more serious.
