After he said that, the laboratory remained silent for the next ten seconds. Xiang Nanxing could only hear the slight sound of the curtains being blown by the wind, and Yue Ming's heavy breathing behind him.

"The ......"

The latter held back for a while and finally couldn't help it: "You don't care about thirty-seven twenty-one, try to roar first." ”

Xiang Nanxing still maintained a confident posture with his hands on his chest, but he couldn't help but turn his head and glance at him. "Just talk too much!" He scolded in a low voice, "Originally, she couldn't hold back and was about to come out!" ”

Yue Ming was about to say something to fight back, but at this moment, he heard a chuckle suddenly coming from somewhere in the room. In the next second, he saw a person standing up in the direction of the podium, with long hair and a shawl, but it was a girl.

"It could have come out, but I wanted to see how you reacted, so I endured it for a while."

As soon as this girl spoke, Yue Ming also recognized her voice: "Sure enough, it's Senior Sister Fenghua!" ”

The other party gently pulled the loose hair back to his head, tied it up with a hairband, and then took out a small dough from his waist pocket and patted it on his face a few times, and easily removed the temporary white foundation. At this time, although Ji Fenghua, who was standing in front of them, was wearing completely different clothes than usual, his proud demeanor was the same as always.

"Senior Sister Fenghua, if you don't go to the show, which one are you playing here......" Xiang Nanxing held his forehead with his hand, and faintly felt a little headache.

"I just chose the more interesting side." Ji Fenghua smiled, "I thought you were lying to me, but I didn't expect to be really stupid enough to investigate what 'Seven Incredible' is here." It's normal to want to take the opportunity to play tricks. ”

"I guess you're the only one who thinks that." Xiang Nanxing didn't bother to tell her more.

"Wait, what's going on?" Yue Ming still looked confused, "Wasn't Senior Sister Fenghua still hanging on there just now?" And the man who left the footprints? I said the one who jumped out of the window, whether he really can? ”

He was incoherent in his series of questions, and it was clear that his heart was in turmoil. Xiang Nanxing waved his hand to signal him to wait, and then raised his head to look at the ceiling: "Where to start...... First of all, there is never a second person in this room, everything is a scene written and directed by the senior sister. ”

"But she's hanging ......"

"Let's start with the hanging scene." Xiang Nanxing stretched out his hand to Ji Fenghua, "Senior sister, that rope should be at your feet, right?" Please hand it to me. ”

Ji Fenghua smiled, bent down and took out a rope from the place where he was hiding just now. Originally, it was her job to explain these things, but since Xiang Nanxing was willing to do it for her, of course she was also very interested in hearing how far this junior could analyze.

"First of all, the rope itself doesn't have any mechanism. But to do that like that, you just have to ......"

Xiang Nanxing took the rope and passed it through both armpits, tied a slipknot around his chest, and then tied another circle and put the rest of the rope around his neck. He tried to pull it from above, trying to throw the rope onto the pipe above, but after thinking about it, he didn't do it again.

"Anyway, you should be able to see it clearly." Xiang Nanxing raised his hand and pulled up the rope, and stuck out his tongue along the way, looking like the "hanged ghost" in myths and legends, but Yue Ming, who was standing in front of him, could see clearly that as Xiang Nanxing pulled the rope up, the rope loop around his neck did not mean to tighten at all, but the circle on his chest was obviously tightened. As he lifted one arm, the armpit on that side could not be clamped, and the rope he was holding was slowly moving upwards.

"That's pretty much what it feels like. The stress point is all on the chest, which is equivalent to hanging the body with the strength of both shoulders without hurting the neck. Xiang Nanxing explained, "And as you can see, if you raise your hands high, the tightened rope will move upward, and it is difficult to arrange the rope well, and if you keep this state for too long, your hands will be numb, so I guess you should step on the chair when arranging, and keep this state until you are about to see us appear before quickly kicking the chair off." The hair is also spread out so that we don't see the rope wrapped around our body. ”

He continued: "Then, when we saw all this outside the building, we wanted to come in and come to the rescue, but to enter this classroom from the front of the chemistry building, we needed to go through the door, go upstairs, and then go around a long corridor, even if we ran at full speed, the process would consume tens of seconds or even a minute of our time, which is not long, of course, but it is enough to eliminate the traces." ”

He reached out and grabbed one end of the slipknot, pulled hard, and then jerked again, and the whole rope immediately untied from him as if it had come to life. Xiang Nanxing rolled up the rope and reached out and patted the experimental table: "Of course, if I am hanging on it at this time, of course I will fall down at the same time as untying the rope, which is the origin of the two shoe prints on the table." If it weren't erased, the two shoe prints would have been a bit forward and backward rather than parallel, and the shoe prints themselves would have been a little dragging mark, because they couldn't stand firm in a very standard way when they just landed, and they had to rub back and forth to stabilize their bodies. On the other hand, if someone else hangs the senior sister here, there should be two very clear footprints left. If you don't do something, if you are a discerning person, you can see the problem at once. This is also the real reason why it is necessary to leave shoe prints on the windowsill, but also to wipe the shoe prints on the table. It is not troublesome to wipe it off, and it is a matter of wiping it with a sleeve. ”

"I really don't know about girls." Ji Fenghua pursed his lips and said, "How can you wipe it with clothes, of course I use a tissue." ”

She smiled: "But all the other parts are right, and it's hard for you." ”

"Wait, wait......" Yue Ming said, holding his head, "I just caught up and confused you again." I can understand the special tying method of pretending to hang yourself, but what about deliberately leaving footprints on the windowsill? Could it be that the shoe print was left by the senior sister herself? ”

"Of course." Xiang Nanxing smiled, "If we chase it out, no matter how hard we try to find it, we will find that there are no other footprints outside at all." Then during the time we went out, the senior sister who was originally hiding in the laboratory could take the opportunity to run away, which formed a perfect secret room impossible event. ”

He lifted his foot and kicked on the edge of the windowsill, leaving a shoe print with only the front half.

"You can see it, it's impossible to jump out of the window with just one step in such a posture. Senpai, she's shorter than me, and she can't stand and kick this foot, but even if she jumps, if she doesn't continue to move forward after stepping on it, she will only fall into the room. Xiang Nanxing said, "Time is limited, she can't leave too realistic traces, I'm afraid she doesn't even have time to add an action to open and close the window, and leave footprints in the middle of the window sill." So she could only accomplish two things in the end, one was to leave this shoe print, and the other was to close the curtains, hoping that we would notice the anomaly of this window. Of course, because the window is tightly closed, it is not impossible to explain that there are shoe prints on the inside of the windowsill and there is no shoe print on the outside, we can understand that the prisoner made a mistake in his busy schedule, and only remembered to erase the traces after closing the window first, but he could only wipe off the shoe prints on the outside, which is also the direction that the senior sister hopes to mislead us. But if you think about it, there is no need for the prisoner who will do this to close the originally open curtains, which is simply a reminder for others of their escape route. ”

"So, the answer is revealed."

Xiang Nanxing stretched out his hands at Ji Fenghua: "This is a prank that senior sister did for us, right." ”

"It's really you, I really didn't see the wrong person."

Ji Fenghua chuckled and applauded, without the slightest embarrassment on his face after being pierced. Yue Ming next to him was directly stunned: "Senior sister, is this really the case?" ”

Seeing the latter nodding, the guy who was still trembling just now suddenly showed a crying and laughing expression: "Why are you doing this!" ”

"It's fun." Ji Fenghua shrugged.

"By the way, there's another question I'd like to confirm with you." Xiang Nanxing said, "Just outside the music building, the person I saw was you, right?" ”

He pointed to the mud shoe prints on the windowsill: "Most of the places in the school are paved with concrete walkways, and only places like green belts have mud, and the one near the music building is still very sticky red mud because of some special vegetation, which is not easy to wash off even after washing, and there will be some residue even after running for a long time." Well, this is it. ”

He wiped a little reddish dirt with his fingers: "This is the proof." ”

"I was wrong in my judgment at the time, the goal of the mystery man was not to erase the traces of 'incredible' events, but to create them. The remotely controlled music box in the music building is just one of them. After that, you left that shoe print in a big shoe in the biology building, then set up those weird traps in various fields, and finally came to the chemistry classroom to pretend to be a ghost who hanged himself, trying to create a corpse that mysteriously disappeared from the room. If everything goes according to your plan, it's hard not to be suspicious of atheism, and that's what you call 'fun', right? ”

Speaking of the back, Xiang Nanxing was almost forcefully asking the other party, and Ji Fenghua's expression gradually changed from indifference at the beginning to confusion, and finally showed an aggrieved look, looking pitiful.

"Wait, I don't understand from the middle."

Ji Fenghua almost burst into tears: "The one you saw outside the music building was indeed me, but the big pile you said later...... I don't know anything! ”

Although I thought that this would be an acting act, but seeing this girl's pitiful appearance, Xiang Nanxing, who was still very firm in his thoughts just now, couldn't help but hesitate. "Not you?" He asked cautiously.

"Hmm." Ji Fenghua nodded, "Or can you introduce me first?" ”

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