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Tobirama Senju certainly wasn't being sarcastic—he was simply stating facts.
Although he used one more clone than Yūshin during Rasengan experiments, this was still the technique's development phase. Producing stable results was far more important than combat practicality at this stage.
Combat applications would be the next consideration.
Tobirama's clone responsible for "rotation" released its hands and stepped aside. His main body and another clone carefully cradled the Rasengan, bringing it close to a large tree trunk.
The Rasengan's power spoke for itself—it embedded effortlessly into the trunk.
Tobirama Senju was extremely satisfied with this level of power. At this stage, the technique could finally be truly called Rasengan.
After dispersing the chakra in his hand, the three Tobirama Senjus regrouped. Moments later, another Rasengan appeared in their hands...
This proved his earlier success wasn't mere luck.
He'd truly grasped the essence.
Tobirama Senju dispersed the Rasengan again. Seeing Yūshin about to ask questions, he spoke first: "I'll explain after I wake up. I must rest now."
With that, he went to where Yūshin had been lying, collapsed sideways, and within moments, soft snoring began.
Tobirama Senju was indeed exhausted.
Though extraordinarily gifted in ninjutsu development and capable of achieving results so quickly, his effort and dedication couldn't be ignored.
Still...
Yūshin found this guy quite skilled at keeping people in suspense.
...
Tobirama Senju slept four to five hours. After eating and replenishing fluids, he finally explained to Yūshin:
"Normally, controlling Rasengan's shape requires grasping a specific 'balance.'
Most shinobi must rely on their senses and repeated trial-and-error experience to maintain this balance.
Finding this correct 'feeling' typically takes ordinary people three to five years."
Quite accurate—if Yūshin remembered correctly, the Fourth Hokage spent three years developing Rasengan.
"I'm different. I used a foolish method, converting abstract feelings into concrete numbers."
"Elaborate?" Yūshin naturally wanted to know Tobirama Senju's approach.
"Rasengan's chakra divides into two parts: rotating chakra and shape-maintaining chakra. So how much chakra should rotate, and how much should maintain shape?
This question has concrete answers. If internal rotating chakra equals 100, first, compressing chakra into spherical form requires external chakra necessarily exceeding 100—this is easily understood.
When chakra begins low-speed rotation, shape-maintaining external chakra equals 57.
When chakra reaches medium-speed rotation, external chakra becomes 35 to 23.
When chakra rotates at maximum speed, external chakra drops to 15.
I tested this bit by bit. It has nothing to do with talent—truly the most foolish method."
Yūshin: "..."
He understood Tobirama Senju spoke of ratios, not absolute numbers. However... this method was indeed very, well, straightforward, but Yūshin had never considered this approach. Who could imagine ninjutsu development involving data analysis?
Not only hadn't he thought of it—the Fourth Hokage who invented this technique certainly hadn't either.
After consideration, Yūshin couldn't help saying: "Never expected such an effective verification method. However, precisely controlling chakra output isn't simple for ordinary shinobi."
Easy to say, difficult to execute. Even telling Yūshin when to output "57 units"—could he do it precisely?
Tobirama Senju nodded: "This requires persistent practice. Actually, somewhat imprecise control can still produce Rasengan, but ninjutsu development demands excellence."
"Numbers like 57 and 15 aren't precise either. Next, I plan to refine Rasengan's internal-external chakra ratio by another magnitude."
"..."
What could Yūshin say? He could only think "worthy of you indeed."
Tobirama Senju continued using his "foolish method," spending a week to refine data by another magnitude—precise to one or two decimal places. Such precise data was beyond Yūshin's pursuit.
Yūshin only sought smooth Rasengan usage in combat, not maximum or optimal power.
According to Tobirama Senju, even perfecting Rasengan to the utmost would only increase destructive effect from 100 to barely 110.
Yūshin possessed self-awareness—regarding chakra control, impossible was impossible.
Of course, Tobirama Senju had only found optimal ratios. Even he couldn't yet apply Rasengan in actual combat.
Never mind Yūshin—Tobirama Senju's requirement for Rasengan usage was naturally "single-handed instant activation." Only thus could it complement his Body Flicker Technique. He was still far from that goal.
Regardless, after completing Rasengan's initial development, Tobirama Senju should leave.
His injuries had healed. In fact, due to Rasengan, he'd stayed too long.
When Tobirama Senju expressed departure intentions to Yūshin, Yūshin naturally had no reason to dissuade him. He'd extracted sufficient benefits—forcibly demanding more would be impolite.
"Let's end here. I have a premonition we'll meet again."
Yūshin saw off Tobirama Senju. After leaving camp some distance, Tobirama said this.
They were merely chance acquaintances. Perhaps because he'd gained some things here while losing more, Tobirama Senju had deep impressions of these wandering shinobi hiding in deep mountains.
He was an extremely strong sensory ninja, having intentionally or unintentionally memorized Yūshin's chakra characteristics.
"Meet again? Perhaps. For wandering shinobi like us, destruction happens overnight. Powerful clans like the Senju or your mortal enemies the Uchiha cannot comprehend our weak feelings." Yūshin said.
Tobirama Senju opened his mouth, finally unable to resist saying: "The Senju are indeed strong, but... have you heard this phrase: 'Swift wind and thunder, flowing water and light'?"
Yūshin was stunned. What did this mean? Were there shinobi clans stronger than the Senju in the ninja world?
Tobirama Senju directly ignoring the Uchiha was within Yūshin's expectations.
Tobirama Senju shook his head without further explanation, saying: "The current ninja world is so chaotic—no one can predict the future. As I said... farewell, until we meet again."
No need for excessive sentiment. Tobirama Senju turned and departed.
Yūshin glanced at his retreating figure, then returned to camp.
Indeed, Tobirama Senju left quite gracefully—if one ignored the scroll on his back stuffed with tea leaves.
...
Though Tobirama Senju had departed, his benefits extended beyond this.
After Yūshin returned to camp, he saw Tobirama Senju's former residence—a simple wooden table with a solitary ninjutsu scroll.
Yūshin's face showed an "as expected" smile.
He approached the table, opened the scroll, which recorded another Water Release technique called Water Severing Wave.
This wasn't tea's reciprocal gift, but Rasengan's reciprocal gift.
Though Tobirama Senju helped overcome Rasengan's greatest technical difficulty, this technique still counted as Yūshin's ninjutsu. Regardless, this technique's principles and concepts originated from Yūshin.
After all, the invention world has an important principle: 1% > 99%.
Tobirama Senju obtained Rasengan, so he needed to exchange it for an equivalently heavyweight offensive technique.
Yūshin quietly stored the scroll, thinking Tobirama Senju truly hadn't disappointed his expectations—a principled person.
People say (old version) Tobirama Senju is cunning and unscrupulous, but through actual contact, Yūshin decided to abandon such stereotypes. Tobirama Senju was clearly someone who repaid kindness and treated all fairly—a genuinely good person.
After finishing 'The Art of Communication,' he decided to write another book: 'The Art of Transaction.'
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