Wha...
He wasn't keeping watch outside!
How was he here?!
In the crimson Sharingan, amid the astonishment, the reflection of a boy whose camouflage slowly faded from the same rock color as the surrounding stone walls emerged bit by bit as he stepped forward and threw a punch. With a crack, immense force came through the fist, splitting the Masked Man's spiral mask. An alarmed and furious thought flashed through his mind.
Sharingan?
That damned insight! Without that insight, right now...
At that moment, the rock-colored camouflage on the boy's body slowly faded away. He lightly clenched his teeth, his entire body still held in the posture of stepping forward and throwing a punch as he slowly leaned ahead.
His fist had already sunk deep into the Masked Man's face, passing straight through his head! The Chakra in his hand had erupted through Monster Strength, yet it struck empty air and had no effect at all!
He had waited a very long time for this moment. Only after Obito had relaxed his guard, believing victory was assured, had he launched his attack in hopes of landing a fatal blow.
But Obito possessed the Sharingan—indeed, the Mangekyō Sharingan—and his perception far surpassed that of an ordinary Three Tomoe Sharingan. The instant the attack came, he noticed it in advance. By the time the Monster Strength in his hand erupted, Obito had already turned intangible through Space-Time, and his punch missed.
In the end, this kind of surprise attack had still failed.
He had not even had time to switch to the sealing Curse Mark Jutsu and attach it to Obito to prevent him from using Space-Time.
It could be said that this surprise attack had failed completely.
All the patience and waiting since Obito had appeared had come to nothing.
This