-Formless Heavenly Hand Realm!
Whoosh!
Sasuke flickered out of Limbo: Border Jail's attack range!
Madara's gaze sharpened. Through his Rinnegan, he saw the outline of a barrier. "Hmm? Could that be..."
The spectators watched from beneath the awning.
Hiruzen asked blankly, "What just happened?"
Though Tobirama could not see it either, he could infer what had happened. "Without a doubt, Madara attacked using those invisible Limbo shadows, and Sasuke escaped with his own dōjutsu. But moving that far in an instant seems well beyond the range of Sasuke's dōjutsu."
Hashirama stared intently overhead. "A barrier! He's deployed a barrier centered on himself!"
Understanding dawned on Tobirama. "So, just like Madara's damned Limbo shadows, that barrier can only be seen... with the Rinnegan?"
Obito saw the underlying principle. "That must be the effect of activating the ocular powers of both his eyes simultaneously. I see. Though Amenotejikara and Heavenly Reverse Hand have different names, they're essentially techniques of the same system. So activating both eyes' powers at once produces an amplified effect!"
Indeed, Formless Heavenly Hand Realm was a technique Sasuke could use by maximizing the ocular powers of both eyes!
It allowed him to deploy an invisible barrier centered on himself and freely swap the positions-or even the states-of things within it!
Because the area-wide barrier replaced the need to focus his gaze, even air could "easily" serve as a medium for swapping!
[Note: Amenotejikara could theoretically swap an object with air as well, but locking on required more ocular power. Thus, in actual combat, Sasuke generally used Amenotejikara to swap tangible objects, only swapping with air as a last resort. Examples from the original work include forcibly pulling Madara and Kaguya between his and Naruto's techniques when they worked together to seal them, and swapping with air to appear