If it flew further north from Redmountain City, it would soon fly out of the territory of Nine Heavens Big Domain and enter the vast void.
The speed of the airboat was just over 600 miles per hour. It had only been a bit more than 6 hours since the event broke out in Ying Clan's castle last night. It meant that the airboat might have only flown about 8,000 miles away.
If the airboat kept flying northward, Zhang Tie could definitely catch up with it.
When he thought about this, Zhang Tie instantly activated his invisible shen bead once again. Closely after that, he flew off the treetop and chased after the direction where the owl saw the airboat leaving for as fast as a lightning bolt.
When Zhang Tie left there, he took a look back and found an airboat with the symbol of Force Emperor Immortal Palace had just reached 300 miles away from Redmountain City. It might arrive at Redmountain City in a short while. 'It seems that the powerhouses dispatched by Force Emperor Immortal Palace have finally arrived …'
Zhang Tie flew northward as fast as a lightning bolt. At the same time, he slowly recalled the look of the airboat that the owl saw. After enlarging the image in his mind, he observed it carefully. At this moment, the airboat was Zhang Tie's only clue.
The airboat that took away the members of Yin-Yang Sect was the most common small-scale airboat in Motian Realm. It was only a bit longer than 100 m. It was the most classic air-feather class airboat in Motian Realm. The appearance and performance of air-feather class airboats had been tested in Motian Realm for a long time. The manufacturing drawings of air-feather class airboats were completely open to the public in Motian Realm and could be produced in many places. Although air-feather class airboats might have their own features according to the requirements of different customers, they were almost the same in appearance. Like cars of a certain brand and model in Taixia Country, they were almost the same in appearance. What was more, that airboat didn't have any emblem or flag of an immortal palace or clan. Such airboats could be found in each corner of Motian Realm. In the sky, there was one air-feather class airboat in every five airboats.
Even though Zhang Tie had lotus-flower eyes, it was still impossible for him to find such an airboat from 8,000 miles away. Zhang Tie's lotus-flower eyes couldn't lock onto a target from 8,000 miles away. If that airboat had just flown away for a couple of hours and was within 1,000 miles, it might be possible; however, it was out of Zhang Tie's maximal ability. Zhang Tie found that there were as many airboats as carps in the river within 2,000 miles. They were flying in different directions. It was like fishing for a needle in a haystack.
However, it was not impossible to fish for a needle in a haystack. What counted most was that he had to remember the look of that needle in order to have a target.
Like how two leaves on a tree couldn't be completely different or identical, so could an airboat. As long as an airboat had been used, it must be different from other airboats.
Thankfully, that owl had a very good vision in the night. Although the airboat was average, Zhang Tie still found three distinguishable subtle features on the airboat with his outstanding ability — —
First, the color of the airboat. That airboat looked about 70% new without any lacquer. Only by this feature, this airboat could distinguish it from over 60% of the other airboats.
The second feature of that airboat was that some exposed mortise and tenon points in the metal universal mortise and tenon structure of the hatch door in the middle of the airboat were slightly deviated. This deviation was caused in the process of manufacturing and manual assembly. Each airboat had it. Commoners could barely notice it. However, if the two diagonal lines of the hatch door in the middle were drawn, the diagonal lines would become coordinates. As a result, the angular deviation of the airboat became an important feature.
Third, there were some faint friction marks on the port side of the stern of the airboat. The friction marks might be caused by the airboat when it was unloading cargo. There would always be some friction marks on the unloading port at the stern of many airboats.
These were just the three features that Zhang Tie found in the owl's mind in a short period of time. Although owls had good vision, they could only see limited details in the night. If it was Zhang Tie, he could even find 300 features, not to mention three. However, at this moment, the three features were enough.
Any one of the three features could not help Zhang Tie lock onto this airboat; however, with the combination of the three features, Zhang Tie was more than 95% likely to lock onto this airboat. Plus the corresponding time and space elements, Zhang Tie was almost 100% sure to lock onto this airboat.
As Zhang Tie flew towards the north, he was thinking rapidly. The map of the north of Nine Heavens Big Domain had appeared in Zhang Tie's mind at once. Zhang Tie was analyzing it rapidly.
The airboat was flying towards the north. However, north was just a general direction. During the past few hours, the airboat might adjust its direction at any time. However, it couldn't turn around; otherwise, it would enter the territory of Force Emperor Immortal Palace in Nine Heavens Big Domain. Given the process of those people raiding Yin-Yang Sect last night, Zhang Tie knew that the leader of those people was definitely not an idiot. As long as he was not an idiot, he would never make such a stupid decision of turning south after flying northward for a short while. Because it was a waste of time. Therefore, the first direction that the airboat left Redmountain City last night should be their general direction.
However, the northwest of Redmountain City and Nine Heavens Big Domain was Force Emperor Domain.
'Are those people from Force Emperor Immortal Palace?' 'Of course not. If Force Emperor Immortal Palace discovered that the members of Yin-Yang Sect were hiding in Redmountain City, they would definitely dispatch powerhouses here secretly and catch all the members of Yin-Yang Sect aboveboard; instead of being so sneaky or killing all the disciples of Yin-Yang Sect in the castle. At least, they should catch them alive so as to display the power of Force Emperor Immortal Palace. However, what happened in Ying Clan's castle was a slap to Force Emperor Immortal Palace's face no matter whether Force Emperor Immortal Palace could discover the fact that Yin-Yang Sect was hiding in Redmountain City or not.
Therefore, although those people left towards the north, they would never go to Force Emperor Domain.
Therefore, the airboat was in a fan-shaped region with a maximum angle of 110 degrees and a maximum distance of 8,000 miles. The line on the left of this fan-shaped region would at most pass Dragon Emperor Big Domain; the line on the right of this fan-shaped region would at most be parallel to the east of Nine Heavens Big Domain; instead of going south …
As Zhang Tie thought about it, the map of Motian Realm in his mind had already turned into a holographic three-dimensional dynamic map. On the holographic three-dimensional map, a huge trumpet fan-shaped region in the north of Redmountain City had turned yellow. Meanwhile, hundreds of flashing airboat routes appeared in this yellow fan-shaped region, which corresponded to hundreds of destinations far away from each other, including regions and cities in Motian Realm. The distance between those destinations varied from 10,000 miles to hundreds of thousands of miles. Now that the airboat had left Nine Heavens Big Domain, it had to find a place to go back. If it left in this fan-shaped direction, its final destination could only be one of the hundreds of destinations.
After multiplying the time when the airboat left Redmountain City by the maximal speed of the airboat and 70% of its maximal speed, a distance zone would be obtained. After putting this distance zone on the hundreds of airboat routes in the fan-shaped region, a more eye-catching oval-shaped red air zone appeared at the trumpet mouth of the yellow fan-shaped region in Zhang Tie's mind sea. The entire red air zone covered about 7 million square miles.
If nothing unexpected happened, the airboat should be in this red airspace at this moment.
The red air zone in Zhang Tie's mind sea was constantly expanding each second, which indicated the changes of that air zone over time. After a few more hours, this red air zone would become larger and contain more variables. However, at this moment, this air zone was still within the worst range for Zhang Tie.
Numerous airboats were left behind by Zhang Tie. At the high speed of almost 30,000 m per second, it only took Zhang Tie a few minutes to fly 5,000-6,000 miles and approach the northern edge of the red oval-shaped air zone. After arriving there, Zhang Tie changed his flight direction. He didn't fly straight; instead, he started to fly horizontally in the shape of a zigzag.
Any air cavalry knew that such a flight direction was the basic tactical movement for searching the fan-shaped air zone. If they wanted to search the circular air zone, they should fly in the shape of a spiral, which was equal to plowing over that air zone.
Zhang Tie was the founder of air cavalries. All the teaching materials about air cavalries were compiled by him. Of course, he could do it easily.
In this case, only Zhang Tie's terrifying flight speed and lotus-flower eyes could accomplish this task in a short period of time, which seemed to be impossible to accomplish.
As Zhang Tie flew across the red oval-shaped air zone in his mind sea at a high speed in the shape of a zigzag, he glanced over those airboats in this air zone using his lotus-flower eyes.
Finally, after a few minutes, a feather-class airboat over 300 miles on the left side of Zhang Tie's flight route entered Zhang Tie's vision.
At the sight of that airboat, Zhang Tie narrowed his eyes as the three external features of the airboat corresponded with each other in a split second. Closely after that, Zhang Tie flew towards that airboat. When he was over 60 miles away from the airboat, Zhang Tie scanned the airboat with his lotus-flower eyes once again. In a split second, the airboat became transparent. In the reinforced compartments at the bottom of the airboat, Zhang Tie finally saw those captives of Yin-Yang Sect.
All the captives of Yin-Yang Sect were in a coma and kept in different compartments. After identifying them carefully, Zhang Tie saw Ji Yuelan and Jiang Ruoxin who were also in a coma. Until then, the two women were still in men's clothes.
After leaving Redmountain City for less than 15 minutes, Zhang Tie had found Ji Yuelan and Jiang Ruoxin.
After finding that the two women were still alive, Zhang Tie finally became reassured. Meanwhile, it proved that his judgment was correct. He finally fished out the needle that had fallen into the ocean.
The others on the airboat might not have imagined that there was such an abnormal person with such an abnormal ability in this world. After they left Redmountain City for one night, that person had arrived at Nine Heavens Big Domain from Dragon Emperor Big Domain in a few hours. Then, it took him less than half an hour to locate them among tens of thousands of airboats in the vast air zone over 8,000 miles away from Redmountain City. 'F * ck, he's not human at all!'
Zhang Tie almost arrived above the airboat in a split second. Sticking to the airboat, Zhang Tie observed the situation inside the airboat and waited for a chance to save them …
(To be continued.)
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