Chu Yanli nodded and said, "Zining noticed something amiss before Wu Lie made his move, so she preemptively set up the Mystic Light Tracing Shadow Array to capture the images and had Fan Sijin, her personal female officer at the time, carry them out of the Imperial Palace..."
The Mystic Light Tracing Shadow Array is mentioned in the "Great Change Heavenly Origin Formation Solution."
This is an extremely mysterious array with a very special mechanism. It doesn't record in real time but reconstructs images retroactively.
That is to say, when the Emperor and others entered the palace back then, the array was not in operation, so it wouldn't have been detected. After they left, Fan Sijin activated the array to record the reconstructed scenes into the Image Stone.
This indeed was a relatively safe method.
But Chen Mo was still somewhat puzzled and asked, "Since Empress Xu realized the Emperor was going to act, why didn't she just escape the palace?"
