The week had settled into a rhythm.
Section Seven in the afternoons, where Tsunade's demands were precise and her praise nonexistent. She'd assigned him to pathway mapping, cataloging the degradation patterns across her fourteen veteran cases, looking for commonalities that might inform the cellular template approach. Tedious work. Important work. The kind of work that wouldn't show results for months, maybe years.
Training mornings with whoever would have him.
Evenings alone, experimenting.
It wasn't peace, exactly. The village hummed with war preparation. Supply convoys increasing, patrol schedules tightening, chunin being pulled for border assignments. But for one week, Team Jiraiya was on stand-down while their commander recovered, and Tatsuya found himself with something he hadn't had in months.
Time.
---
Duy was already moving when Tatsuya arrived at the eastern training ground.
Deep in a kata that looked almost lazy until you noticed the precision, each position feeding into the next without pause or preparation. The Eternal Genin finishing a handstand sequence that would have crippled a normal spine, then dropping to his feet with a bounce that suggested he could do this all day.
Which he probably could.
"You're late." Duy didn't break his rhythm, already transitioning into the next sequence.
"By three minutes." Tatsuya dropped into position without waiting for a response. Arguing with Duy about punctuality was like arguing with gravity about falling. Technically possible, ultimately pointless. "Five hundred each?"
"Five hundred each. Pushups first."
The first hundred went quickly. The second hundred reminded him that he'd been doing Section Seven work instead of conditioning for the past three days. The third hundred started the familiar burn in his shoulders.
"Oi, form's slipping—elbows in!" Duy barely glanced over. He could probably count reps by breathing pattern alone. "You've been sitting too much, your hip flexors are tight. We'll work on that after."
He adjusted. The burn got worse.
"Looking forward to it."
"Ha! You should be." Duy bounced on his heels, somehow managing to look energetic despite the pre-dawn hour. "Flexibility prevents injury, and also it hurts, which builds character. That's the power of youth!"
"That's not how character works."
"It's how my character works. Four hundred, keep going."
Tatsuya kept going.
The pushups finished. Squats followed. Then lunges, then burpees, then a sprint sequence that left him gasping on the grass while Duy stood over him looking mildly disappointed.
"Slower than last week."
"I was stabbing people last week." He pushed himself up on his elbows, still catching his breath. "Different kind of training. Felt like cardio at the time."
Duy grinned. "Up! Taijutsu forms. We're working on your pivot today."
The next hour was a blur of corrections. Foot placement. Hip rotation. The angle of his shoulders when he moved from stance to stance. Duy didn't explain; he demonstrated, then made Tatsuya copy, then pointed at whatever was wrong and waited for him to figure it out.
"Your left shoulder drops when you pivot." He tapped Tatsuya's shoulder blade, then his hip. "So where should the rotation start? Not the torso—here."
Tatsuya adjusted. Tried again.
"Better, but still dropping. You're compensating for something—what?"
"Old rib injury. Healed months ago, but..." He trailed off, shrugging.
"Hah. Old injuries." Duy stepped back, demonstrated the pivot himself, slow enough that Tatsuya could see every muscle engagement. "Watch my shoulder — what's it doing?"
"Staying level."
"Right! And yours drops because your body still thinks the rib is broken. Doesn't matter that it healed — the body remembers." He clapped his hands once. "So we teach it again. Come on!"
Tatsuya tried again. Better this time, but still not right.
"Good."
"That wasn't—"
"I said good, not perfect. There's a difference." Duy's grin was quick and genuine. "Tomorrow we do this again and you'll be slightly less terrible." He bounced back, settling into a ready stance. "Now—spar. Try not to die immediately this time."
Tatsuya lasted eight seconds before Duy put him on his back. Staring up at the sky, he felt it again — the same helplessness from the field, Jiraiya's blood on his hands. Gone before Duy's hand appeared above him.
"Improvement!" Duy offered him a hand up, still cheerful. "Last week was six. You'll get there — youthful spirit, right?"
---
Kushina had laid out enough sealing supplies to stock a small shop.
Brushes in three different sizes. Ink wells in varying formulations. Blank scrolls, practice paper, cheap stuff that could absorb a failed seal without catching fire.
Usually.
"You're early." She didn't look up from her own work, brush moving in strokes that looked careless but probably weren't. "By ten minutes. Suspicious—what did you break?"
"Nothing yet."
"Tch. The 'yet' concerns me." She finished whatever she was doing, a containment array from the look of it, and finally glanced at him. "Sit. Brush. Show me your storage seals first."
Tatsuya sat, picked up a brush, and ran through three quick storage seals. The muscle memory was there now: containment matrix, dimensional anchor, stabilization ring. Three elements flowing together almost automatically. The first two held clean. The third wobbled but stabilized.
"Better." Kushina examined the third one critically. "Still ugly as hell. But functional ugly, which is improvement." She pushed the practice paper aside and pulled out a fresh scroll. "Time for something harder."
"Explosive tags?"
"Not yet. You'd blow your damn hands off." She drew a series of concentric circles on the scroll, then added interconnecting lines that reminded him of a spider's web. "OK so — barrier seals. This is the good stuff. Containment, protection, exclusion. Storage seals have three elements, right? Barrier seals have seven, and they all have to talk to each other or the whole thing falls apart."
Tatsuya studied the pattern. The outer ring was similar to his storage work, but the inner layers were different, overlapping boundaries, each one reinforcing and constraining the others.
"OK the principle is resonance—" Kushina leaned forward, hands moving as she talked. "Each layer vibrates at a frequency. If they harmonize, stable barrier. If they don't..." She shrugged. "Things get unstable."
"Define unstable."
"Remember the Third District grounds?"
"The trees?"
"Different incident. Same principle." She tapped the scroll. "Copy this. Slowly. Feel how each layer connects to the next."
He started drawing. The outer containment felt familiar, almost identical to storage work. The second layer was trickier, a binding element that had to anchor to the first while leaving room for the third. By the fourth layer, he could feel the pattern wanting to fight itself.
The fifth layer destabilized. The ink just... dissolved, spreading across the paper like water into sand.
"Hmm." Kushina studied the failure. "That's actually not bad for a first attempt."
"It fell apart."
"It fell apart at the fifth layer. I didn't get past the third on my first try." She pulled out another sheet. "Again. And this time, don't think of them as separate layers. Think of them as one structure being built from multiple angles."
He tried again. Made it to the fourth layer before the resonance collapsed.
Again. Fifth layer, then dissolution.
A fourth attempt actually reached the sixth layer before the whole thing shuddered and went flat, not dissolving this time but becoming inert, the chakra draining away like someone had pulled a plug.
"Closer!" Kushina was watching with actual interest now, not just teacher's patience. "You're getting the resonance. The problem is the seventh layer, the capstone. It has to lock everything else in place without adding new tension."
"That sounds impossible."
"That's 'cause you're thinking like a surgeon. Look — sealing isn't about cutting. It's about balancing forces that don't want to balance." She drew her own barrier seal in the time it took him to read her hand movements, the brush flowing through all seven layers like they were one continuous line. The finished seal hummed faintly, then settled into quiet stability.
"Show-off."
"Obviously." She slid the scroll toward him. "One more. If you can get all seven layers down without it collapsing, even if it doesn't activate, that's enough for today."
Tatsuya picked up his brush. Breathed. Started the outer containment.
First layer. Second. Third. The resonance was building, but he could feel where it wanted to fight itself. Fourth layer, and this time he adjusted the angle slightly, letting the binding element curve instead of corner. Fifth. Sixth.
Seventh.
The seal didn't activate. But it didn't collapse either. It just sat there, all seven layers visible, the ink stable and dry.
Kushina picked up the paper, examined it from multiple angles. Poked it once.
"...Huh." She looked at him, then back at the seal. "It's not active. But it's structurally complete."
"Is that good?"