"I'm not underestimating you." His gaze strayed down, fixed on her fingers curled around the edge of his cloak. If anyone could pull it off simply through force of will, he'd consider her a contender. "I'm being realistic. This isn't something anyone understands -- not the how, not the why. There's no information to gather. It just happens."

Was it despair coloring his words? Probably. But it was also honest realism. There was no way he knew of for Tenten even to find out more about their unpredictable returns home, let alone return to a time before she left.