Lin Rui took the chieftain, and the two of them walked along the side.. As he was going upstairs, Lin Rui suddenly squatted down and touched the doorknob leading to the rooftop with his hand.

"What's the matter, boss?" said the chieftain.

"It's been opened recently, and it should be within a day or two. Lin Rui raised his finger and showed the chief to lower his voice, "There is no dust accumulation, but there should be no one here who will often go to the rooftop." ”

"So what?" said the chief.

"Unless they have the same purpose as we do now, which is to conduct surveys before they act. Lin Rui lowered his head, carefully checked the footprints on the stairs, and said in a low voice, "It's the rubber bottom print of the combat boots, and the footprints overlap, at least more than four people." ”

"You're convinced, you can tell that?" the chief froze.

"You can see it if you look closely, but it's nothing. The person who taught me scouting and tracking was even more powerful, and he could even sniff out the smell of the other person with his nose in the jungle. Lin Rui smiled.

"It can't be, you must be joking with me. The chief was surprised, "A man is not a dog. ”

"Don't believe it, many indigenous Africans have been trained to track and identify prey in this way. They can survive on a spear in the African wilderness. What they rely on for survival is a keen sense of sight and smell, which is the most primitive hunting instinct of human beings. Lin Rui put away the gun, pressed the earphones and whispered, "Cobain?"

"Hello Captain, I'm here. However, if you have anything, it's better to be concise, we are still analyzing suspicious people. Cobain replied.

"I can help you narrow it down, check the surveillance footage from the day before yesterday to find out who passed by us on the rooftop. By my inference, there were at least four of them, or more. Locate these people and then keep an eye on them in surveillance video. Most likely, they are the ones who have been bought by the strategist Mark Lovesky. Lin Rui said in a low voice.

"Okay, I'm looking it up. There was nothing noticeably abnormal the day before yesterday, but yesterday. At least five people had been on the rooftop, and at about the same time period. It is clear that they did not act together in order to avoid attracting attention, but went to the rooftops separately. When leaving, they also went their separate ways. So I can at least target these five people. Cobain whispered, "Are you sure there's something wrong with them?"

"At least seventy percent or more. Lin Rui replied, "This is in the FBI's training base, which is full of cameras, surveillance and listening equipment. If they want to discuss something, the safest place on the rooftop unconscious, there is no camera monitoring and listening equipment, and no one will know what they are communicating with each other in the open space. ”

"I see, the day before yesterday was the day when the Order and Aladdin set a time for a meeting. So yesterday, these bribed armed guards will definitely try to meet and discuss a specific plan. There's no safer place than the rooftop of the FBI's academic building. Cobain snapped. "Okay, I'm going to keep an eye on these guys. We will notify you of any changes as soon as possible. ”

"Okay. Lin Rui cut off the communication and patted the chief on the shoulder, "Let's go, let's go back." There are other things to do. ”

"Is that the end?" the chief whispered.

"That's right. Lin Rui said in a low voice. "This should be their escape route. The armed guards don't need to flee, because their identity is the best cover. So one of the main purposes of their investigation here is to gather enough information for the evacuation of Makolovsky and others. So that they can prepare in advance. ”

"And what do we do now?" the chief whispered.

"Get out of here and go somewhere else. Lin Rui turned around and went down the stairs until he returned to the auditorium. Lin Rui looked at the other team members around him and said in a low voice, "What's here?"

"There are no explosive devices, and it seems that they wanted to go with us, so they didn't want to make too much of a fuss. Because once the movement is big, it will be difficult for them to escape. Sausage whispered, "We've checked the windows all around, and there are a few suspicious ones. ”

"Oh, where?" said Lin Rui with a frown.

"Come and see. Here the glass of several windows was wiped clean. The glass of other windows is relatively more blurry. Sausage whispered, "I thought they wanted to snipe through these windows from a distance, so they checked the window glass." ”

"Actually?" Lin Rui frowned, "Actually, I have found that there is no good position to snipe here. There is only one possibility, someone left fingerprints on the glass. They are there to avoid being discovered when they are traced afterwards. So I figured out that this was not their firing point, but their break-in point. ”

"Breakthrough point?" Lin Rui frowned.

"Yes, they descended here from the upstairs rooftop location zipline and then assaulted through the window. As we defend a few entrances with all our might, their hand will seem very sudden. Rope descent and window assault, a typical aT special armed tactical unit tactics. Sausage replied.

"But this window pane is characteristic, and it is quite strong. They can't be knocked by rappelling from the roof, and even if they shoot, they may not be able to break it. If the rope comes down and hangs out of the window and can't get in, it's embarrassing. Lin Rui knocked on the glass with his hand and frowned. "This thickness and strength should be bulletproof standards. ”

"Yes, that's why they're moving this window. They removed the pins around the window pane that were used for fixing, and although the glass surface remained intact and there were no flaws to be seen, once it was struck vigorously, it would fall off in one piece due to the lack of metal pins. They can rush in through the window. Sausage whispered.

"That's a good idea, but what do you think would happen if we quietly put these metal pins back together?" Lin Rui chuckled and whispered.

"Put it back? so that the windows are so strong that they can't get in. They would hang on nylon ropes, slap heavily against bulletproof glass, not up or down, and not get in at all. When the time comes, there will be a row of dancing Spider-Man hanging from the window. Sausage's eyes lit up.

"So what are you waiting for, get to work! Remove the metal pin from that window and install it here. Let these guys who are going to raid us have a good taste of this. Lin Rui slapped the palm of his other hand with his fist.

"Understood. Sausage nodded, "I'll do it right away." ”

Sergei also laughed, "Rick, you're so bad, if you do this, those guys who can't go up will be embarrassed." ”