"Here's how it happened, Instructor Zeng hid a gun near the grass in advance, then buckled the firecracker with a can, pulled out the lead, and put the lead on top of a lit cigarette, just like this."

As I spoke, I asked Zhang Kexin for a cigarette, demonstrated Zeng Susu's technique, and continued to add

Then Instructor Zeng proposed to surprise Instructor Niu on his birthday, and Instructor Zhang made a joke with him, the two of them first smeared the blood from the blood bank or somewhere on the legs and the ground, and when Instructor Niu and we found out about the situation and went to call someone, the two of them walked out of the warehouse according to the plan, hid in the grass, and planned to see Instructor Niu's surprised expression, but after arriving at the grass, Instructor Zeng started another plan, he picked up the gun hidden in the grass in advance, and aimed the muzzle of the gun at Instructor Zhang's chest, But he didn't shoot, he waited, waiting for the moment when the burning cigarette lit the fuse, and with the sound of firecrackers, he pulled the evil trigger, and then took the gun back to the warehouse, put the gun on the ground back on the shelf, and then wounded his own leg, and then put the gun that killed on the ground. ”

After listening to my reasoning, everyone was quiet, obviously hundreds of people gathered together, but the whole scene was silent, Zhang Kexin asked in disbelief

"Can you time it so accurately? The time a cigarette burns isn't that easy to calculate, is it? Was it possible to happen to ignite the fuse at that moment? ”

"He's been killing since a year ago, and over the years, he must have been tested countless times to ensure that his plan works perfectly."

Hearing me say this, Guan Shuang asked

"How do you know he killed a year ago?"

I explained with a smile

"How do you think his bullets came from? Instructor Niu said that he missed the target twice in a year, and I guess he didn't really miss the target, but planned to kill Instructor Zhang a year ago, so from that time, he began to look for opportunities to secretly hide the bullets. ”

The instructor asked, still unrelenting

"What proof do you have for that? If Lao Zhang walked out on his own, then why was there a trace of the body dragging in the warehouse? ”

"That's not a trace of dragging the corpse, before that, let me explain what the row of blood droplets is about: if you can't find any blood belonging to Instructor Zhang in the warehouse, it will definitely be suspected, so Instructor Zeng should have used something like a hand towel to suck Instructor Zhang's blood, but on the way back to the warehouse, the blood absorbed by the towel accidentally dripped on the ground, Instructor Zeng's figure is about the same as Instructor Zhang, so the cadence is almost the same, which also makes us mistakenly think that Instructor Zhang's corpse is walking. Then he wiped the floor with the bloody towel, so it was not a trail of dragging the corpse, but a trail of wiping the floor. ”

Officer Hu asked with a puzzled expression

"What was he mopping for?"

"Didn't I just say that they applied some blood that didn't belong to the two of them before, his original plan was to return to the warehouse immediately after killing Instructor Zhang to dispose of the blood, because if it was detected that there was other people's blood at the scene, it would definitely arouse suspicion, originally he planned to scrub all the blood clean, and then shed Instructor Zhang's blood on the ground, but his plan had an accident."

"What accident?"

"There are five of us. According to Instructor Zeng's calculations, it takes about 8 minutes to ask Instructor Niu to call a doctor first, and then go to the other direction to call a companion. However, because of our arrival, the call for the doctor and the call for his companion were carried out at the same time, so that he had about 3 minutes less time to deal with the scene, and he could only mix Instructor Zhang's blood with the previous blood indiscriminately, praying that he could get through the confusion. ”

At this moment, Zeng Susu's face was like ashes, and it seemed that my reasoning was correct, but Niu Coax still defended his comrades

"Is there any evidence for what you say?"

Without waiting for me to speak, Officer Hu took the initiative to answer

"It's very simple, we only checked the blood type at the scene before, and we didn't find anything abnormal, now we just need to compare the DNA of the blood at the scene, if it is three people, then we can prove that the murderer is..."

I patted Officer Hu on the shoulder and shook my head

"It doesn't need to be that troublesome."

"How?"

I glanced at Zeng Susu and said with a little sadness

"Actually, there is one thing I forgot to mention, that is, when he injured one of his legs, there was no sound of firecrackers as a cover, so he had to find a way to silence it. He must have pressed a pillow against the muzzle of the gun, which had a silencing effect, and I found a down in the blood of the warehouse, which should have been left at that time. I'm guessing you used a vacuum pocket to put away the pillow and blood-stained towel, you had a gunshot wound at the time, and you didn't have time to dispose of it, and, judging by the circumstances, you didn't have time to dispose of it, so I believe you should have hidden it in a corner of the warehouse, and if we can find what I said there, and we can extract your fingerprints on it, we can prove that the murderer is you. ”

Hearing this, Officer Hu hurriedly ordered his subordinates

"You go and look for it."

Zeng Susu sighed and smiled bitterly twice

"Hehe, don't be so troublesome, I dug a hole in the ground and hid it inside, you dig it out, I'm afraid it will stain your clothes."

As soon as Zeng Susu's words came out, it was tantamount to admitting his guilt, and the instructor's head shook Zeng Susu in disbelief

"Lao Zeng, did you really do it!?"

Zeng Susu bowed deeply to the instructor's head to apologize, and then turned his head to ask me

"Your name is Song Yang, right? How did you suspect me? ”

I held out two fingers and spoke slowly

"There are two points, the first is that you didn't have time to dispose of it, the blood from the blood bank, let me guess if it will be this method."

Zeng Susu's eyes widened and he asked in disbelief

"Impossible, without professional testing, how can you see with the naked eye that it is not the blood of me and Instructor Zhang, but the blood from the blood bank?"

I pointed at Guan Shuang and said

"He told me."

"Me? When did I tell you? Guan Shuang asked suspiciously

"You told me that the blood in the hospital's blood bank has anticoagulants, so it won't coagulate, and I just remembered that after a long time, the blood at the scene of the crime hadn't coagulated, which means that it wasn't ordinary human blood, but blood with anticoagulants, in other words, it was obtained from the blood bank, which gave me inspiration."

Zeng Susu shook his head helplessly and asked

"It's kind of interesting, but what about the second point?"

I didn't rush to answer, but turned to Su Yong

"Brother Yong, what would you do if you entered the dormitory one day and found that several of us were injured?"

Su Yong said without thinking about it

"A doctor, of course."

"And then?"

"And then?" Su Yong scratched his head and said

"Then, I should call the police, right?"

"That's right!"

Hearing me say this, Huang Qiuhui excitedly tugged Su Yong's arm

"You're right, you're right, it's amazing!"

"Then you see, how smart I am."

I ignored these two flirtatious young men and women, turned my head to look at Zeng Susu and said

"Whoever encounters this kind of scene will call doctors and policemen, but isn't it strange that you asked Instructor Niu to call doctors and comrades-in-arms? The only explanation is that you are worried that if you call the police, Instructor Zhang, who is pretending to be dead, will stand up immediately because he feels that he has played too much. ”

Zeng Susu actually applauded me

"Amazing, amazing observation, when I was a child, my mother told me that I can't do bad things, it seems to be true, I didn't expect to meet someone like you..."

Zeng Susu gave up resistance completely, his voice became smaller and smaller, and even his eyes began to moisten, and I interrupted him

"It's not that I'm good, it's that I have a group of amazing friends, Zhang Kexin who can help me find intelligence, Guo Hongyi who can help me find clues, Guan Shuang who can tell me professional knowledge, and..."

I glanced at Su Yong, who was looking at me with very expectant eyes, thought about it, and said

"Oh, no, thanks to the efforts of the three of them, it's like writing an essay, they gave me all the inspiration, ideas, and materials, and in the end I just did a summary and writing work."

Su Yong said indignantly

"Huh? Song Yang, what do you mean? ”

Zeng Susu smiled bitterly

"Hahaha, well, may your friendship last forever..."

"Of course!"

Immediately afterwards, Zeng Susu was taken away by the police, and later we learned his motive for killing, Zeng Susu and Zhang Xiaoxiao enlisted in the same year, and the two were originally very good friends, but because Zhang Xiaoxiao made a boring joke, Zeng Susu's girlfriend braved the heavy rain to look for him in the army, and there was a car accident on the way, and he died on the way to the hospital for treatment, so Zeng Susu had a murderous intention.

Later, the police found the vacuum packaging bag that Zeng Susu had hidden in a very secret place, which also became the decisive evidence, according to Zeng Susu, he originally wanted to wait for the police to leave and deal with it at dawn the next day.

After the case was over, I still dialed Zhang Fan's phone number and explained the matter very proudly, I wanted to show it off, but I didn't expect him to say it disapprovingly

"What, it's obviously a very simple case, if it were me, I would know who the murderer was in 1 minute."

In the face of his attitude, although I have long been used to it, I still can't accept it, and I rolled my eyes and said

"Just blow it!"

Zhang Fan said without hesitation

"Just check the smoke reaction."

I laughed when he said that

"Haven't you been losing your strength lately, so what's the use? Even if the shooting residue was detected from Instructor Zeng's body, he could be sure that it was because he was shot, and it was meaningless. ”

"Stupid, I mean comparing the amount of residue on the two of them, the same gun, the same amount of residue left on the body after each shot, if the body surnamed Zeng is detected to be twice as large as the body surnamed Zhang, it means that the surname Zhang has only experienced one shot, and the surname Zeng has experienced twice, it means that the murderer did not shoot the two of them at the same time, the surname Zeng is lying, he is the murderer."

Hearing this, I choked for a while, the case that I had solved in such a long time was actually solved by him lightly, but I still said strongly

"You are clearly from God's point of view, if you don't know that Zeng Susu is the murderer, you didn't expect this method, who would have thought of testing the gunpowder reaction like this?"

When I say this, it's completely a dead duck's hard mouth.

He said in an annoying tone on the other end of the line

"This technique is clearly a parody of Lady Agatha's Nile tragedy, you can see it at a glance, and I have used similar plots in my novels for a long time, don't you know?"

"Huh? When have you used it? ”

"I knew you weren't looking! I once asked a man to pretend that he was stabbed blind, and after everyone left, he went to kill people, and when he came back, he really stabbed himself, and everyone didn't believe that a blind man could..."

"Alright, alright, I'm too sleepy, hang."

……

In front of so many teachers and students, the murderer was correctly pointed out, and our dormitory was really beautiful, but the days had to go on as usual, and the military parade on the second day still had to continue.

When we stood in the square and prepared to enter, Ding Yubin still asked in disbelief

"Did there really be a murder last night? You've solved the case? ”

"It's true! Last night a few of us were so imposing, and a whole bunch of people saw it, and you slept like a dead pig..."

While we were chatting, Niu came over, and after the events of last night, he was much more friendly to us, less flamboyant, and even a little shy

"Today... Let's go, don't let Instructor Zeng and Instructor Zhang down. ”

A few of us replied kindly as if we had forgotten what had happened last night

"Hmmm! Don't worry, we're going to be good! I won't let you down! ”

"Good! Come on! ”

Then, with the mentality of winning glory for several instructors, we walked out of the penultimate place with high spirits, which made us understand that Instructor Zeng said that we were the worst before, and he was not lying to us.

After the parade, our university life officially began.