Many male classmates looked at Fang Lubai and pointed down, and several female classmates next to them blushed and pinned their faces to the side.

Fang Lubai was also a little stunned, and then there was a smile on his face: "That's right, everyone does have some truth in what they think, the metal belt buckle will cause scratches, but the wound on the victim's right hand has a slight bruise, and the bruises are in the form of a slender band, so everyone only guessed half right." ”

Seeing that Fang Lu only said half of what he said, the students under the lecture hall were a little impatient: "Say it quickly, don't hang people's appetites!" ”

"There is only one possibility of this kind of band-like wound, that is, the crushing caused by the hard metal, the subtle bruising caused by the rupture of the subcutaneous capillaries, so when the victim struggled, he grabbed a metal watch on the murderer's wrist."

The students were speechless, Fang Lubai took a sip of the water in the kettle and continued: "There is a gold-filled denture inside the victim's mouth, the location is very obvious, if the murderer really killed for robbery, then he will not forget the gold-filled denture, from which it can be inferred that the murderer and the deceased are not familiar with each other, only a few sides, plus the metal watch on the murderer's body has just been judged, so the murderer's economic income is not low, and the money obtained from the victim's stall is just to hide people's eyes, He actually had other plans. ”

"What exactly is the purpose of the murderer?" The surrounding students involuntarily asked.

The corners of Fang Lubai's mouth raised slightly: "This, Professor Nie needs to answer." ”

Unexpectedly, this kid actually kicked the ball back, and Nie Wenguang's hand that just picked up the water cup paused for a moment. Looking at those eyes, he took a breath, and then flipped the courseware a few times: "Look at it yourself, don't ask questions, all questions are used as after-class exercises for this class, and I will answer them randomly before the next class." ”

On the white curtain, sure enough, a fifth suspect appeared. I saw him wearing a white shirt and a pair of silver-white flat-rimmed glasses on the bridge of his nose. Through the heavy lenses, everyone can feel a faint fear in their eyes, as well as a hint of relief.

Nie Wenguang on the podium obviously didn't want to speak, he held the water cup in both hands, and turned over his notepad with a solemn face.

I don't know when, Fang Lubai, who was sitting in the back row, disappeared, and the students looked away with a lost face, and whispered to discuss the question that Fang Lubai had just thrown.

......

Fang Lubai naturally sneaked out.

With a cigarette in his hand, Fang Lubai looked at the sky outside.

Throwing the cigarette butt into the sink, Fang Lubai lifted his pants and slowly walked towards the lecture hall.

"This classmate, you come up, okay, let's ...... next"

A familiar voice came from the classroom next to him, Fang Lubai couldn't help but look at it curiously, only to see Han Tian standing in a small classroom, and there was a teenage girl standing next to him.

"Classmate, please turn around." Han Tian put his hand on her shoulder and motioned for her to turn around.

Fang Lubai was a little curious, and couldn't help but walk into the classroom from the back door and look at the two people on the stage.

"The murderer used this kind of hemp rope at the time." Han Tian raised the hemp rope in his hand, then pulled the student's hand behind him and slowly tied it with the rope.

"The murderer had been a sailor on a ship before his death, so every time a body was found, the victim's hands were always tied with sailor knots. When the victim's body is found, the ten fingers of both hands will always be uprooted, and there will be splattered blood droplets on the ground nearby. ”

A female classmate quickly took it up and answered the question asked by Han Tian succinctly.

Han Tian had his back to the student at this time, fiddling with the sailor knot in his hand, as if it was not tied beautifully enough, he loosened the rope and tied it again.

"Okay, please take a seat." Han Tian waved his hand, and then he patted the girl: "The murderer obviously brought many victims to his residence, why did he take the trouble to bring people out again, and the villa that never knows where it is, what do you think about this?" ”

Fang Lubai casually pulled up a chair and sat down in the crowd. Looking at Han Tian on the podium, Fang Lubai felt that the students were very close to him.

"I know!" A boy stood up: "The murderer took the victim out of the prison to prevent leaving too many clues!" ”

"Xiaoguang did a good job today." Han Tian nodded, and then said: "But you are only half right, the fatal wound on the victim's body is the slender knife mark, so in order to prevent leaving clues, it is only one of the reasons, it can be said that the murderer did not do this to cover up the clues." ”

Seeing that the students' feedback was mediocre, Han Tian continued: "The main reason why the murderer does this is mainly to be clean, and it can also be said that the murderer has a certain habit of cleanliness. Every time he tied the sailor's knot, even the number of loops on the knot was the same, which proved that the murderer had a strong psychological quality and a certain obsessive-compulsive disorder, so he sent out letters and the iconic sailor's knot and the letter opener every time. ”

"Slowly, the killing and intimidating methods of cutting off people's fingers and opening letters to kill people gradually could not satisfy his perverted psychology, so in a kidnapping, he chose an innocent citizen, and finally randomly selected three policemen."

The students were afraid to come out, as if they were listening to a ghost story, and the whole classroom was a little scary.

The female classmate standing on the stage seemed to be a little uncomfortable, twisted her body uneasily, and she blinked her eyes at the classmates in the audience.

"From then on, he was no longer satisfied with cutting off people's fingers, but in an even more brutal way* one victim, and then brutally killed two policemen......"

At the moment when the atmosphere was unusually solemn, the alarm clock hanging on the door frame rang, and the students realized that it was time for the end of class.

"Okay students, this question will be left for the next class to continue the discussion, if you are interested, you can try to learn the sailor knot I just arranged, this sailor knot I learned for a week, I hope you can learn it." Okay, let's take a twenty-minute break! ”

The students were packing up their things with a look of disappointment on their faces. The girl on the stage saw that Han Tian had no intention of untying the knot, her face was flushed, and tears were rolling in her eyes.

Looking at the girl on the stage, Fang Lubai was a little helpless, she didn't expect that after several years, this kid's EQ was still so low.

"Hey, you can't bear to throw a schoolgirl on the podium?" Fang Lubai stood up and greeted Han Tian who was coming.

Han Tian found Fang Lubai sitting below, he was stunned for a moment, then looked back at the female classmate on the stage, as if he had thought of something, and patted the male classmate next to him a little embarrassed: "Xiaozhu, you go up to help Qian Hui, if you can't even solve you, you will punish me in the next class, my friend and I have something to say." After finishing speaking, he threw the textbook on a desk, hugged Fang Lubai and walked out.

"It's ruthless." Fang Lubai pursed his lips and looked at Han Tian dissatisfied.