The camera seemed to have been placed in the mountains, and it was handheld, without any stabilizing equipment.
The image swayed as someone walked, and the mountain scenery it captured shook along with it.
There were birds calling, insects chirping, wind blowing, and rustling sounds from some unknown source.
Suddenly, a voice came from offscreen.
It was Gu Mo's voice.
"This sound isn't right."
The video paused.
Nangong Yao asked, "Have you heard other sounds?"
"No, no. It's the ambient sounds. They're all in front of the camera. Wherever the camera has walked, there's no sound behind it."
Liu Miao asked in surprise, "You can tell that?"
"Professional!" Gu Mo said proudly, then added, "Though the main thing is talent."
"You'd need professional recording and playback equipment to hear that, wouldn't you?" Nangong Yao asked.
"If this video shows what that person saw and heard, then the equipment is professional. The human ear is enough to tell the direction and distance a sound comes from. As for the playback equipment... These ears of mine are professional too." Gu Mo looked smug.
"But the computer speakers are right in front of us," Liu Miao said, puzzled.
"Hey, there's no explaining this to an untalented amateur like you," Gu Mo said.
"Enough showing off," Liu Miao said irritably.
"Hey, silly little kid..." Gu Mo started to say more, but Nangong Yao cut him off.
"So everywhere she's been, there's no sound?" Nangong Yao asked.
"That seems to be it," Gu Mo replied.
Their conversation was like a commentary track, except the video had been paused.
After they finished talking, the video continued playing.
Listening closely, one could almost make out that the ambient sounds came from far away, as if they were reaching the camera from somewhere in front of it.
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