After asking this question, Kakashi stared intently into Su Yu's eyes.
Su Yu smiled at his words, then said, "Kakashi, you should be a smart man. There's no foundation of trust between us, so no matter what I answer, you won't believe me. Asking is pointless."
Kakashi fell silent for a moment. He knew Su Yu was telling the truth. Whatever Su Yu said, he would ultimately trust only his own judgment.
Still, he said, "Regardless, I'm Naruto's teacher. I want to ensure his safety."
Su Yu said, "That's also why I'm willing to tell you this much. Sigh, let's discuss something very real. In this world, strength decides everything. Whether you believe it or not, whether you want to believe it or not, at least at this very moment, that rule is in effect. So even if I had ill intentions toward Naruto, would you-or rather, Konoha-really have the power to stop me?"
Kakashi's expression changed beneath his mask, and his aura instinctively erupted. Yet that rainstorm-like pressure vanished in an instant. This was not of Kakashi's own volition, but because of the hand Su Yu had placed on his shoulder at some unknown point. Though that hand looked powerless and truly rested only lightly on his shoulder, Kakashi's rising aura melted away like ice and snow under the warm sun.
Kakashi instinctively wanted to strike, but his reason ultimately kept him from doing anything.
Su Yu said softly, "Kakashi, calm down. If I wanted to harm you or Konoha, I would have acted long ago. I wouldn't have waited until now, and you wouldn't have been able to stop me. The Nine-Tails might seem invincible to you, but to me, he's no different from an ordinary fox. So there's absolutely no need for you to worry. Rather than