In the throne room where Octavius was silently sitting on his throne and listening to the minister who is responsible for making sure all the wells get built perfectly in the villages at the right time informing his majesty of how many wells were successfully built and everything the emperor needed to know about this.
After this, the emperor got up which is why all the people present in that room stood up respectfully for the emperor even if they had no idea why his majesty suddenly did that, and left the throne room right after when the meeting was almost over.
What made the people present in the throne room stunned is how some guards stormed inside the room and arrested Winston who was as stunned as the rest " Wait! What is going on? Let go of my arms for God's sake."