"What about Flying Thunder God, then?" Hibari raised an eyebrow and hurried to ask.
Looking at his expectant eyes, Senju Tobirama finally smiled. "Flying Thunder God, huh... there's another prerequisite for learning that technique. That depends on whether you can perform to my complete satisfaction in tomorrow's assessment."
"What prerequisite?" Hibari asked eagerly. "If we're talking about knowledge of space, I think I qualified ages ago. Why don't you write up a test, Second Uncle? I'll take ten written exams if you want!"
"If Flying Thunder God only involved space, why call it a 'Space-Time' technique instead of simply 'Space-Time Ninjutsu'?" Senju Tobirama countered.
Without waiting for Hibari to ask again, he explained, "Of course, the 'time' part doesn't mean you need to study time itself. That's the domain of genjutsu.
"The 'time' I'm referring to concerns your own body. I never classified Flying Thunder God as a Forbidden Technique. In theory, anyone can learn it. The problem is..."
He looked at Hibari, his tone growing more serious.
"Your physical capabilities have to keep up. You need to adapt to drastic changes in your relationship with space within an extremely short interval!"
Hibari's eyebrows shot up. "Second Uncle, how could my body not keep up? Look around all of Konoha. How many people can you find with more bounce in their step than me?"
"Who said anything about being tough?" Senju Tobirama glared at him. "I'm talking about neural reactions! Your reaction speed wasn't up to scratch before. Flying Thunder God is absurdly fast. If your brain can't keep up, learning it will just get you killed.
"Besides, if your reactions really aren't good enough, you won't even get past the entry requirement-I built a specific hurdle into the technique."
Hibari thought it over and decided his Second Uncle had