The reason for placing recording devices on the mass actors at the command post was simply to capture the entire exercise process in preparation for a summary afterward. Perhaps, natural barriers have shielded the positioning system but not necessarily damaged the recording equipment because these are two electronic structures with different working principles. Moreover, even if, like the positioning system, sound waves from the event could not be recorded after the incident due to shielding, strong evidence might still be found in the sound waves recorded before the event.
Extracting the recorder hidden on Ye Lao and performing waveform analysis isn't difficult.
Lun Xiaoman had fallen, yet she was unaware she was going to fall at that time. When she was brought to the Red Army Headquarters for confrontation, she was very confident, as she was sure that there might be witnesses, but certainly no physical evidence.
