Nantian handed the small bowl forward, Ma Feifei and Ma Tiantian didn't dare to slack off, and hurriedly stabbed their fingers with the silver needles that Zhao Ruitian gave them.

The tip of the needle pierced the finger and immediately punctured, and a drop of blood was squeezed out of each of their fingers.

"Okay, that's enough, just a little. Nantian said.

Then, Ma Feifei and Ma Tiantian dropped two drops of blood into Nantian's bowl. As soon as the blood dripped into the bowl, it was on the small piece of peachwood.

Nantian took the bowl back, muttering words as if he were saying something, and then took out a few pieces of straw paper from his bag.

Nantian quickly tied the straw paper into the shape of a villain, and after a villain made of straw paper was formed, Nantian grabbed a handful of powder from the bag, and then sprinkled it on the villain, burning instantly.

The burning villain was thrown into the small bowl before by Nantian again, and the blood-stained peach wood also burned. Catalyzed by Nantian's Qimen breath, a flame in the bowl burned rapidly, and soon after, the combustion reaction was completely completed.

In the bowl, only a pile of ashes remained.

"This thaumaturgy is called the Spirit of Ashes. And the mystery is inside this ash. Nantian said, taking out a handful and smearing it on the back of his hand. "With the Qimen breath, catalyzing this little bit of ash, it is possible to find the trace of the person you are looking for. ”

"Oh, what do you say?" Zhao Ruitian asked puzzled.

Nan Tian said: "As long as you wipe the ashes on the back of your hand and use the Qimen breath to catalyze, everything you did before will have an effect." Remember the powder I added? That powder is a catalyzed phosphor powder. This phosphorus powder is very useful, and if the ashes on the back of the hand are directed in the direction of the little sister who is related to these two gentlemen, the ashes formed by the peach straw paper sprinkled with this phosphorus powder can react and emit a blue light. The closer you get, the stronger the light. ”

"Oh, I see...... This is feasible, but does this ash have a time limit and a distance limit?" Zhao Ruitian quickly thought of the key point of the matter, the method Nantian said looked good, but if there was no limit, it would be too rebellious.

"Not bad. Nantian nodded, and there was a trace of embarrassment on his obscene face, and then said: "This thaumaturgy, only within a range of a thousand meters, will produce a good effect. If you are too far away, you can only react a little. Of course, this is not a problem for us who have a master next to us. However, it's okay if it is not rubbed on the back of the hand and catalyzed with Qimen breath, or even if it is wiped on the hand, it is okay without catalysis. However, once the breath is catalyzed, there is only about two minutes to look for it, and once the two-minute time limit has passed, this ash will lose its effect and become a real ash. ”

When Zhao Ruitian heard this, he lowered his head silently, his mind flowing, and he was a little heavy. There are two difficulties.

Seeing that the ashes in the small bowl were smeared on the hands of him and Nantian, it was estimated that they could come like this less than a hundred times. However, there are more than 100 residential high-rise buildings here, and if one of them is not of good character, then they are not going to do it again?

It's okay to do it again, but the time may not allow them to do it.

Everyone also thought of this, and was silent, all thinking about whether to find it little by little.

Just over a minute later......

"Oh, why didn't you think of it!" At this time, Zhao Ruitian thought of a way, and immediately shouted, slapped his head, and secretly scolded himself for being a fool.

"What, Xiaotian, do you have a better way?" Yang Yiran's eyes lit up, looking at Zhao Ruitian's posture, he basically thought of a way.

"There's no better way. However, Mr. Nantian's method has a very concise shortcut. ”

Shortcut?

Everyone didn't figure it out, and looked at Zhao Ruitian in a daze.

"Brother Ran, this question is actually very simple, when it comes to the principle, it is an arithmetic problem for elementary school students. Zhao Ruitian was proud for a while, and then got serious again. I thought of a solution, but now is not the time to relax.

"Huh?"

"You think two intersecting straight lines can determine a unique point, right?"

As soon as Zhao Ruitian said this, the people present suddenly realized when they thought about it!

Nantian said that as long as the direction is aimed at Ma Tongtong, then the ashes on the back of his hand can glow blue. In other words, a person who can cast the breath of Qimen can easily use this method to determine a straight line from the detection site to the location of Ma Tongtong.

Everyone can think of this, but there will be many buildings in a straight line, and it will be difficult to find them one by one, and then find the floors.

However, Zhao Ruitian is smarter than everyone else, and that's at this point. Everyone only thought of one straight line, but Zhao Ruitian thought of two straight lines.

In the same plane, two intersecting lines have one and only one intersection point. This is a geometric concept that elementary school students understand, and after Zhao Ruitian thought about it for a while, he knew that this concept could be fully utilized.

Now they have Nantian and him Zhao Ruitian, two Qimen masters, and there are two of them who can do this Qimen technique called the Spirit of Ashes.

Then, the two of them stood in two different positions, probed separately, and in the first probing, they were basically able to find their own straight lines.

After finding one of their own straight lines, the two of them extend their respective straight lines, which are two intersecting straight lines, and they can intersect at a point!

This is the principle of two points and one line, and with two straight lines that can intersect, it is easy to determine which point.

"Brother Tian, you are so smart!" At this time, Yang Liang finally understood what Zhao Ruitian meant, and immediately fell to the ground in admiration and said adoringly.

"Yes, two straight lines, one point, Mr. Zhao's method is good. ”

"Then, just do it!"

……

Ten minutes later, the solution was finally formed.

The falcon carried Xie Ting, Wang Bao and Nantian to another part of this residential community, far away from Yang Yiran and them.

Then, Zhao Ruitian and Nantian respectively launched the Qimen aura to detect.

"Found it!" Zhao Ruitian's sensory acuity didn't have to say, he only felt that after his thaumaturgy was cast, it seemed that there was a direction to guide him in the dark, and in less than ten seconds, Zhao Ruitian found this direction that couldn't be said to be a feeling, and at this time, Nantian's side had just begun.

"Xiao Liangzi, take these dozens of balls of wool, use your mobile phone to determine the straight direction, and connect it if you can't run over it!" Zhao Ruitian instructed Yang Liang.

After thinking of a way, Yang Yiran drove to the convenience store at the entrance of the community and bought dozens of oversized balls of wool.

Because, after determining the direction, in order to be accurate and to leave a mark, it is impossible for everyone to rely on visual inspection, so Yang Yiran thought of such a method.

After determining the direction on both sides, they both took the wool over and ran through the entire community. This will always find the point where the yarns intersect. In this way, after finding the spot, the person who found the spot can call the people again, and whoever is on either side just needs to go straight in the direction they found. Eventually, you will be able to find a more precise point.

Although that point is not particularly accurate, how many buildings can there be around a point?

It can be said that this method is quite good, which can not only save time, but also accurately position.

Yang Liang saw Zhao Ruitian's order, looked at the direction that Zhao Ruitian was pointing to, and then took these dozens of balls of wool, and walked in that direction while loosening the threads.

Similarly, not long after, Nantian's side also found the direction, and Wang Bao did the same action as Zhao Ruitian.

……

Time passed unhurriedly, and everyone felt that life was like a year, as if it was half past eight, and it had been nearly half an hour since Yang Liang left, Yang Liang's phone called.

"Let's go!"

Yang Liang's phone called, and there was no need to answer it, because Yang Liang must only have that one message, and he had found a place.

Five minutes later, Yang Yiran drove to the place where Yang Liang was. Soon, the Falcon came over as well.

This community is not small, even if Yang Liang moves quickly, he must consider that there can be no mistakes in the direction, and in addition, Yang Liang only found the intersection of the two wool threads after turning back, in fact, he didn't waste any time, but everyone was anxious, so they felt that life was like a year.

Soon Wang Bao came back again, and everyone was together.

This location, all around, only, four buildings!

It's easy!

Zhao Ruitian took out another smear of ashes and wiped the ashes on the back of his hand, and the Qimen aura was blessed, and the whole person's temperament seemed to have changed.

"Not here, not here...... It's this, it's this!" When it was determined for the third time, the ashes on the back of Zhao Ruitian's hand finally glowed with blue light!

It's been confirmed, it's this building!

Yang Yiran looked along the floor, and could count it at a glance, this is a residential building with a total of ten floors, not too much and not too little.

Since this is the place, let's go!

Yang Yiran said in a deep voice: "Xiao Tian and I will go down to look for it, you guys will be here first, and don't act rashly if there is anything." We'll be back after we've determined the exact number of floors. ”

After Yang Yiran finished speaking, he opened the car door and got out of the car, Zhao Ruitian didn't drag the mud and water at all, took Nantian's bowl of ashes, and quickly opened the car door and jumped out of the car.

Looking at the two figures who entered the building, the others were fine, Ma Feifei, and Ma Tiantian couldn't help but sigh for a while. Unexpectedly, what Yang Yiran and Zhao Ruitian knew and did was really unexpected.