[Flying Thunder God Technique]is a space-time ninjutsu created by the Second Hokage, Tobirama Senju. It is a type of instantaneous movement technique, which uses a special formula to achieve the effect of teleportation.
The caster leaves the Flying Thunder God's formula on any surface their body can touch. When the enemy's body is marked with the formula, it means that the mark of death has been placed. In most cases, the Flying Thunder God's mark will not disappear.
The reason why Minato Namikaze was able to learn the [Flying Thunder God Technique] was based on his unique skills and his deep understanding of space-time ninjutsu, allowing him to achieve instant movement.
To put it simply, the technique locates coordinates with the special Flying Thunder God formula, and then brings the caster to that location in a way similar to the [Reverse Summoning Technique].
It seems very simple when explained, but it is extremely difficult to master.
[Summoning Technique] and [Reverse Summoning Technique] are not very difficult to learn, because [Reverse Summoning] only needs the help of a summoning beast to form seals and cast the [Summoning Technique] in reverse to achieve space transfer.
Meanwhile, [Summoning Technique] requires the caster to sign a contract with a summoning beast, and through the contract, the caster can summon the beast.
However, [Flying Thunder God Technique] requires the user to form seals and teleport themselves to a previously marked coordinate.
In other words, the caster must draw a seal similar to the [Summoning Technique] on a special kunai, and then perform the [Reverse Summoning Technique] elsewhere to teleport themselves to the designated location.
To complete this requirement, not only must the caster have extremely strong chakra control, but also a deep understanding of space-time principles.
Without a summoning contract, the caster must have a high degree of compatibility with space in order to move through it.
Rather than calling [Flying Thunder God Technique] a teleportation ninjutsu, it is more accurate to say that it signs a psychic contract with oneself and then uses the [Reverse Summoning Technique] to teleport.
The idea of Minato Namikaze undoubtedly opened a door for Chao Yanqian.
Although the method of learning through summoning may seem a bit unorthodox, it is not easy to master.
And the first thing Chao Yanqian had to learn was the sealing formula of the [Flying Thunder God Technique], which belongs to the field of fūinjutsu.
Speaking of it, Minato Namikaze could learn the [Flying Thunder God Technique] thanks to the help of his girlfriend, Uzumaki Kushina. Without the Uzumaki clan's mastery of sealing techniques, Minato would not have been able to achieve instant movement through this method.
Because to locate the coordinates for the [Flying Thunder God Technique], the formula of the [Summoning Technique] and the chakra of the caster must be sealed into the space through sealing arts. Without sealing knowledge, it would be impossible to fulfill this requirement and to establish the coordinates.
Chao Yanqian already had a certain understanding of some basic sealing theories. Thanks to Orochimaru, if it hadn't been for the information on sealing techniques found in Orochimaru's laboratory, Chao Yanqian would have had to start learning from scratch, which would have taken an unknown amount of time.
But overall, with the selfless help of Minato Namikaze, Chao Yanqian gradually mastered the [Flying Thunder God Technique] and reached the basic standard necessary to learn it.
When Minato saw that Chao Yanqian was able to complete a [Flying Thunder God Technique] formula by himself, he was quite shocked. Minato himself had suffered a lot to master the seal formula for the [Flying Thunder God Technique], but Chao Yanqian managed to learn it in just one month.
"Chao Yanqian, I really didn't expect you to learn it so quickly!" Minato said in surprise.
"Standing on the shoulders of giants. Thanks to your experience, Senior Minato, I was able to learn quickly. If I had to do it alone from scratch, I might not have been able to complete this ninjutsu in my lifetime," Chao Yanqian said humbly.
During the month of learning the [Flying Thunder God Technique] formula, Chao Yanqian truly felt Minato Namikaze's brilliance. Without Minato's prior experience, Chao Yanqian would definitely not have been able to master the technique on his own.
It's just like the ninjutsu [Rasengan]. It took Minato three years to create it, but Naruto Uzumaki learned it in only seven days.
The simplest comparison would be the invention of the light bulb.
When the light bulb was first invented, it took countless experiments. But once the method was developed, as long as you understood the technique, you could replicate it easily.
However, without Minato's experience, if Naruto had to invent [Rasengan] from scratch, it would have been impossible even if given seven years.
From this, Chao Yanqian realized that he was still different from true prodigies.
Even Kakashi Hatake developed his own [Lightning Blade] (Chidori), while Chao Yanqian still couldn't create his own earth-style ninjutsu.
Creating new jutsu not only requires expanding one's horizons but also an extremely deep understanding of ninjutsu knowing not just "what" it is, but "why" it is.
In this regard, Chao Yanqian still lagged behind Kakashi, who came from a prestigious family.
"Chao Yanqian, I really don't know what else you can't learn," Minato exclaimed.
Chao Yanqian knew his own limits, but in Minato's eyes, he seemed like an undeniable genius.
"Maybe soon, Konoha will have a second ninja who can use the [Flying Thunder God Technique]," Minato thought to himself.
"Senior Minato, don't praise me. It's all thanks to your guidance. I can draw the [Flying Thunder God Technique] formula, but unlike you, I still can't use it freely," Chao Yanqian said.
Minato only needed to touch a surface lightly to place the formula, while Chao Yanqian had to prepare paper seals beforehand, wrapping them around kunai to use them for teleportation.
"Haha! To reach my level, you need constant practice. Only when your body becomes fully familiar with using the formula can you directly inscribe it onto surfaces with a touch," Minato laughed.
"Yes! I understand!" Chao Yanqian nodded.
Minato said, "Next, you have to learn how to teleport yourself to the pre-marked coordinates through seals. Don't think it's easy this will be the hardest part. But your chakra control is already very good, so now it's just a matter of practice."
"Like this..." As Minato spoke, he threw a kunai and instantly teleported to it, demonstrating the [Flying Thunder God Technique] for Chao Yanqian.
"I see, thank you very much, Senior Minato," Chao Yanqian said gratefully.
"Then keep practicing! I have a mission tomorrow, so I'll head home to rest first!" Minato said.
Waving goodbye to Chao Yanqian, Minato left.
Watching Minato's departing back, Chao Yanqian thought to himself, "If there's a chance in the future, I must save Minato Namikaze from the disaster of the Nine-Tails attack. If Minato had survived, Konoha might have been a very different place."