After a hurried lunch, Shen Yun said his thoughts to the four of them.

"Do you feel that this mission is a bit difficult?"

Xu Jiyu and the four didn't know how to answer. Isn't it normal for special forces to be selected and the task is difficult?

Looking at the expressions on the faces of the four of them as a matter of course, Shen Yun shook his head. The child is still young, and it will take a while to grow.

"What I said is difficult, not the kind of thinking you take for granted, I think that the selection of special forces should be found. Rather, the difficulty of the task is inferred from the facts. ”

"We've come this way, do you know where you are now?"

The map that Long Feiyun gave them did not fully meet the military standards, so when Shen Yun asked, although the four of them took out the map from their pockets and observed it carefully, they did not come to a conclusion after more than ten minutes.

Walking in front of Xu Jiyu, Shen Yun turned over the map in his hand, and then clicked on one of the locations: "Here." ”

"What?"

After Shen Yun's training, the remaining three fighters finally knew not to speak as much as possible. But at this moment, I still couldn't suppress the shock in my heart.

They felt that the place where they waited for others to go out in the past half day was not far away. But according to the place pointed out by Shen Yun, they didn't go far at all.

Motioning for Xu Jiyu to completely spread out the map, Shen Yun clicked on the red dot at the top of the map.

"The end, here. The distance on the map is seventy kilometers away. You've already experienced how complex the terrain in this area is, and you have to rush over it in three days to complete the mission. ”

"I'm sure that if there is no clear point to tell the location of these dozen light and dark posts, the people who can complete this task in addition to the people who set up these posts must be lucky enough."

"So, I judge, there must be articles on these sentry posts."

After Shen Yun said these words, Xu Jiyu's eyes had already lit up: "Chief, are you saying that there will be some information on them waiting for us to discover?" ”

Shen Yun didn't answer directly, but looked into the distance, and suddenly said: "Is there any, just try it." ”

The crux of the matter now becomes how to find the first sentry.

Shen Yun looked at the map, and in the end, he decided that the five of them would continue to move forward. As long as you go deep into this jungle, you will definitely be rewarded. Because these sentry posts entered the jungle one step ahead of them, even if they were deliberately covered, they would leave some clues in the end.

With these things, a good scout can get a lot of information.

Shen Yun is not a scout who has received systematic training, but he has dealt with many types of troops over the years, so Shen Yun naturally will not fail to learn.

Jungle reconnaissance, although it is not very necessary to ask for the law, but at least it is much stronger than Xu Jiyu and them.

With the four of them, Shen Yun continued to walk forward. For three hours in a row, in this secluded mountain forest, not even a single thing was found.

This undoubtedly made the three young fighters except Xu Jiyu a little discouraged. The young man from the Northeast shook his head depressedly when he was resting:

"Chief, we can't do this. In another three or four hours, it will be dark. In order not to be discovered, you must have dinner before dark. If we continue to delay like this, our time will be wasted in the day. ”

The jungle is extremely unsuitable for movement at night.

After all, wild beasts are infested in this jungle, and people are greatly more dangerous because of their night vision.

What's even more tragic is that they are equipped with empty cartridges, which have no lethality at all.

Hearing this kid's complaint, Shen Yun smiled: "Young." No harvest is not the biggest gain. Compared to the guys who were cleaned up by the hunting team, we are already considered lucky. ”

"Besides," Shen Yun was just about to continue, when he glanced at it by chance, and suddenly changed his words: "Besides, we will have a harvest when we return to the town." ”

Came to Xiao Dongbei's side, raised his foot and kicked him in the ass, Shen Yun said with a smile: "If you kid doesn't complain, I really ignore it." Move to the left to show you what we've learned. ”

Xiao Dongbei moved his body to the side according to Shen Yun's instructions, and then looked at Shen Yun, wanting to listen to his explanation.

But Shen Yun didn't explain to him immediately, but looked carefully around the tree he was leaning on before.

In just a few dozen seconds, Shen Yun picked up a small piece of bark from the ground and got up to make a gesture somewhere on the trunk of this tree.

"He is about 175 centimeters tall, five degrees south-east in the direction, and the time is no more than eight hours. Our goal has emerged. ”

Muttering to himself, Shen Yun handed the bark to Xu Jiyu, who was a little curious.

"Look at it, because of the rapid movement, the body accidentally touches the fragile bark brought up by the trunk. Because of the loss of this piece of bark, the corresponding area of the trunk has a different color than the rest of the tree. ”

"Height can be judged by the height of the contact area, and the dense forest is impermeable, and even if the bark is subjected to air resistance, it will also fall in the direction of the person's movement."

"But why did you decide that the time should not exceed eight hours, instead of three or four, chief?"

This is especially important because this time determines the identity of the person who passes through here.

The bark of the tree had obviously been rubbed off by the rucksack, and if it was a human body, it would not be possible to have only such a piece.

This is very consistent with people's self-protection psychology - when exercising quickly, the body will subconsciously keep a certain distance from obstacles.

Moreover, after a long period of training, the two elbows expand outward the most in the process of marching with a gun, and even if it is scratched, this part will not be missing.

However, if you compare the height of the fallen bark, this person must have grown to more than two meters tall.

Since it was a scratch of a backpack, it could only be the people they were being assessed, or, just the sentry posts, the three arrest teams would not come here to spend the night.

The question comes back to the judgment of time.

Shen Yun nodded.

"When this piece of bark is rubbed off, some of the components in the exposed fresh bark will be oxidized by the air, resulting in a darker color."

"But now that the color is still so light, the oxidation time should be relatively short. Otherwise, we wouldn't have seen it at all. ”

Shen Yun nodded: "Don't forget about the air humidity here, as well as the light intensity. When they rub off this layer of bark, the fresh bark is quickly covered with water in the air after being exposed for a while. When the temperature rises, it will slowly evaporate. ”

At this point, the logic is all straightened out at once.

The four of them looked at Shen Yun's eyes, and suddenly felt a little awe.