Shaking his head at how proud he feels, Minato states, "using your muscles to orient yourself to land properly or attack immediately is nearly impossible under such a strong force. The human body isn't meant to move at such speed around such mass. I mean the force relative to my perspective even allows my body to pass through matter; a home, a tree, or person for example. That's fine for long-distance travel, but it's much too fast for close quarter combat, so, the directional seals—which I wrote on a special kunai I made—also double as a way to fight the gravitational pull thereby slowing your velocity or re-orient yourself for attack or landing."
"So these special kunai not only anchor the stretching of time but also the speed of travel between you and the kunai."
"Or a network of chakra pathways; just in case you have multiple kunai in use," Minato adds. "So, within the pathway, you expel your chakra just like you do in chakra training, and that's how you slow down or turn, or do anything really. Imagine being deep in the ocean and swimming as fast as a fish without your arms or legs; just your chakra."
"That sounds way harder than walking on water," Naruto fearfully comments.
"Practice a great deal, son," Minato advises. "I first practiced expelling chakra from my tenketsu deep underwater. The Hyūga are experts at releasing chakra from their tenketsu so if you know anyone that can give you tips, that'll help quite a bit."
"One of my friends is a Hyūga," Naruto remarks with thoughts of the sweet Hinata. "Maybe she can give me some pointers," Naruto affirms with an amused hum as Minato continues to explain.
Naruto observes carefully, then widens his eyes before he calls out, "holy crap… Since the Space/Time jutsu is linked to the chakra pathways—er, you and the kunai, I mean—that's where the pull on space, time, and gravity is the strongest, but, that's still only from your perspective… which means, from your perspective, you're not moving fast at all! Anything outside the link only thinks you're moving fast because the speed of time relative to their perspective isn't anywhere near as fast as yours!"
Minato laughs happily as his son reads excitedly over his shoulder. "Everyone likes to think the technique is instantaneous teleportation, and to protect the jutsu, I let them think that, but technically, I'm not physically moving any faster or slower than they are. At its simplest form, Space/Time jutsu just enables us to experience the passing of time differently. As long as I use my chakra to control the velocity toward the signature, I see everything—the animals, the terrain, my enemies—as if time has stopped."
"And outside the pathway," Naruto wonders aloud
Smiling fondly, he answers, "outside the pathway, all they see is a yellow flash."
Naruto laughs mischievously as he comments, "I can't believe you're not moving fast at all! That's hilarious!" Minato laughs along with his son, both enjoying the ultra precious moment for how painfully finite it is. Clearing his throat, Naruto strains to move on and ask his father, "the Space/Time jutsu is infinitesimal, so how much can you push the conversion rate?"
"Even though it's instantaneous from their perspective, "Minato starts to answer. "Depending on how much chakra I use to slow myself down, I can make it last a second or hours."
Finally understanding, Naruto reiterates, "because the mechanics of Space/Time is stipulated to be relative to your chakra and contract, you experience however long you need, let's say minutes, in the observer's fraction of a second."
"Correct," Minato happily voices. "In heavy combat situations, it affords me ample time to read the terrain and strategize. However, if you use it in long-distance travel, it can be taxing to use so much chakra to prevent terminal velocity. It's why I use it sparingly. The dynamic signature and the Space/Time array are two of the legs," Minato lectures, filling out more segments of the Fūin contract.
"Connecting it all together is the third leg which is the Fūin contract itself," Naruto answers.
"Correct, son," Minato answers happily. "It's due to the Fūin contract, that the signature—which can be any phrase or word you like—is attached to the function of the Space/Time array. The Fūin contract converts any form connected to the signature into a dynamic link between matching patterns, activating that pathway like a conduit."
"The three legs," Naruto views aloud. "Space/Time to alter time experience and distance traveled in a microsecond, the signature for dynamically linking destinations, and the Seal Contract of bond between the signature and Space/Time jutsu that carefully stipulates the manner of conversion."
"Correct again, however, there's still much more that's needed," Minato claims, writing so close to the grand chamber's wall that the Yondaime begins curving the paper-thin wall of glowing characters. "As you noted, this contract from your mother's clan is expressed using a borate chain to dynamically add logic, but-"
"That function can technically work with two arrays of direction, but it needs way more logic than that if you want it to work properly in any condition," Naruto finishes, adding, "I totally get it."
"I suppose it's impossible for the apple to fall far from the center of the orchard," Minato huffs happily. "That's exactly right. The Fūin contract bonds not only your signature with the Space/Time, but your self as well. We'll need to postulate all the pattern matching as well as all the variables we want the technique to be able to deal with. So, between the Ha characters of each array, you'll write your signature, and as you said, we still have to apply a lot more logic to make sure it all works right," his father says as he continues writing line after line of characters.
"I've seen some versions of this array studying Fūinjutsu contracts, but nowhere near this good," Naruto admits. "Let me guess, with three logic arrays: the signature, the Space/Time array, and the chakra pattern, then you close, it'll work, but only work on the signature; not whatever it's attached to. That's why it'll take days to write out. You have to link more logic arrays to the chain to allow more variables. That way if you draw your signature on any surface and it'll work."
"Or if you use your chakra to mark chakra, it'll still work," Minato states with a grin, accepting he's simply going to continue smiling proudly. "We have to add more logic arrays to encapsulate an almost infinite amount of possibilities because the last thing you want to happen is the jutsu malfunctioning in a pinch. So, you have to add all letters, all numbers—use infinity just in case—all chemical elements, all elemental releases, yin and yang release, sage arrays, proximity alerts, trauma alerts, orientation logic, spatial awareness array, and the echo array so you can navigate between multiple signatures. Please practice a great deal before you use it in battle."
Naruto smirks, feeling fairly confident if chakra control is key, then his clones can help him speed up the training process. He continues reading the squiggly characters like a picture in his mind before voicing in awe, "you can even match individual people, or animals to the logic within the expression, couldn't you?"
Minato can't help his smile before answer, "that you can, son. You'll also need to sanitize the seal to make it impossible for anyone you don't want to hop on the link, for example, if they grab you while you 'teleport.'"
"Sweet," Naruto states looking over the simplified seal.
"Lastly, and this is quite an extraordinary measure," Minato states, finally stepping away from the very long curved wall of characters to admire it with his son. "The entirety of this contract will need to be inscribed with your blood and chakra."
Naruto's eyes widen and he nearly chokes as he looks past his father and over the very long wall of glowing seal arrays, many of which are not even written out to save time. He can't help but yell, "you're kidding!"
Minato shakes his head. "Just like the Space/Time array, this stipulation isn't written down to safeguard this amazing power. As you no doubt noticed, there are many measures in place to prevent the wrong sort from abusing this technique. One of the properties of this contract-based seal design is the blood and chakra necessary to create it, so even if someone stole the contract, and could actually understand it, they wouldn't be able to alter or activate the technique."
"But it's going to take days to completely write all this out perfectly," Naruto gasps. "I don't have that much blood!"
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