There are two forms of observation: passive and active.
Human senses usually receive information passively. For example, seeing objects or hearing sounds occurs because the target emits light or sound waves, which reach the observer's eyes or ears.
In such cases, as long as the observer hides themselves well, they often won't be exposed.
Active observation, on the other hand, requires the observer to send out signals themselves, like radar scanning, or the echolocation of bats and dolphins.
Take a simple example: in a dark cave, to see things clearly, you have to turn on a flashlight to illuminate the surroundings. But when you turn on the flashlight, things in the dark will also notice you.
When a cultivator expands their divine sense to investigate, it is also a form of active observation. Although ordinary people might not feel it, sorcerers, especially those in a state of alert, can detect this disturbance.
As for Hidden Moth, it's a bug. No matter if someone uses passive or active methods to observe him, he can be aware and realize that he is being observed.
He Kao knew someone was observing him. He appeared very patient, sitting by the river fishing, not catching anything for half the day, seemingly in a meditative state.
In fact, he was truly in meditation, as his consciousness had already detached, with his yin spirit flying into the air.
Yin spirit detachment can only reach the range of the divine sense. If in an open area, it can reach up to nearly six kilometers, which is the current limit that He Kao can achieve.
If encountering complex terrain or obstacles, the straight-line distance would be greatly compressed.
If the yin spirit can't extend beyond the range of the divine sense, then what's the point? Isn't it the same as directly using divine sense to probe? They are, of course, different. The most significant difference lies in the aforementioned passive and active forms.
Observing with the yin spirit is still passive in most cases, like an invisible body drifting to distant places to listen and see. For example, the yin spirit can still "see" the moon.
No matter how skilled someone is, their divine sense can never reach the moon, but their eyes can see it.
Precisely because it allows for passive observation, in the yin spirit state, as long as you're not too close and keep divine qi and emotions contained, it's challenging for the target to discover you. This is precisely the exclusive divine technique of the Hidden Moth Sect.
He Kao's current state was peculiar, as if he was overlooking the masses with an emotionless gaze, neither happy nor sad... After drifting for a while, he found his target on the other side of the river.
The night was cool by the river. The person wore a hooded shirt to cover their face, and from the aerial view, He Kao couldn't see the features clearly, only that it was a man. He also didn't want to get too close to avoid being detected.
Sorcerers, especially high-tier sorcerers, have acute spiritual senses. Even if the yin spirit gets too close, it might make the other party feel uneasy.
That person's position happened to provide a clear view of He Kao on the opposite bank. His figure was obscured by wild grasses and shrubs in the night, at a distance of several hundred meters. Under normal circumstances, He Kao would hardly notice him.
At such a late hour, hiding in a place like that without fishing, pooping, checking the phone, or meeting someone, just dazing amidst the mosquitoes, obviously something was off.
Just at this moment, He Kao was suddenly disturbed, and his consciousness returned to his body in an instant, because a beam of light accompanied by footsteps was approaching in the night.
The newcomer was a middle-aged man, a veteran fishing enthusiast who specially brought a headlamp for lighting at night, and he recognized He Kao when he turned his head.
"Oh, isn't this Xiao Kao? How come someone so young has taken up this hobby?"
The speaker was a neighbor from town, named Zhou Shanzhuang, who was also considered a distant relative of He Kao. A couple of years ago, his child went to college, and with some free time, he took up the bad habit of fishing. He frequently came to the river at night.
He had been fishing at another spot earlier, but hadn't caught anything for a long time, so he decided to change his fishing spot. When he turned on his headlamp to switch location, he saw He Kao.
He Kao said, "Uncle Zhuang, you're fishing again... I'm just playing around occasionally, just relaxing."
Zhou Shanzhuang glanced at the plastic bucket beside him and said, "Did you just get here? Not a single fish caught?"
He Kao stood up with a smile and said, "My luck's just not good today. You take your time fishing. I'm heading out; got things to do tomorrow."
During this brief interruption, the watcher across the river had already disappeared. He Kao packed up and left and also saw the van Zhou Shanzhuang came in, parked by the roadside.
Zhou Shanzhuang had bought a few shop fronts at the town's farmers' market for his business. The van could carry people, and with the last row of seats removed, it could also hold goods.
He Kao got into his car. At this point, he once again engaged in yin spirit travel, but couldn't find the infiltrator. Either they had left, or they used some means to block his perception.
Not counting the Hidden Moth Sect, among the Seven Great Magic Sects, the Heart Plate Sect sorcerers are best at tracking, while the Xingshen Sect sorcerers are the hardest to track.
The methods of the Xingshen Sect are strange. Not only are they skilled at detecting and manipulating emotions, but they can also obscure people's perception, mastering various illusion techniques... A Tier Six cultivator from the Xingshen Sect is honored as an Illusion Master, and this speaks volumes.
Illusion Master Li Xiuyuan once said, the most sophisticated illusion is one that matches the real-life scene, only altering or obscuring certain subtle details, such as removing oneself from the real background.
When the Xiao Alliance ambushed Mei Guyu outside Pugang Town, Illusion Master Grosi used this very tactic. Mei Guyu's counter was to break the deceit with force, directly slashing out with a rain of swords, because no matter how great the illusion technique, it couldn't withstand the Rainfall Divine Sword.
