The northeastern woods outside Konoha.
Sasuke darted among the charred treetops, the patterns of his Mangekyo spinning wildly as a blade of light compressed from Lightning Release chakra formed in his hand.
Some thirty meters away, a figure in black kept flickering between tangible and intangible as he dodged. It was Uchiha Obito. The Sharingan beneath his mask watched Sasuke's every move through distorted space, searching for an opening to strike back.
"What, is this all the great Uchiha Sasuke can do?" Obito's voice carried a hint of mockery and probing curiosity. "Starting all these fires—aren't you afraid you'll set the whole of Konoha ablaze?"
"You'll regret saying that very soon." Sasuke's lips curled into a cold smile. He slammed both hands against the ground, and his chakra erupted with staggering intensity. Black flames spread outward like a tide, turning the entire forest into a sea of dark fire. The flames ignited the trees, the ground, even the air, leaving not a single inch of solid footing.
Obito frowned and instinctively used Kamui to turn intangible, shifting his body into Kamui's Dimension. Yet when he tried to materialize again, the all-encompassing black flames had consumed every possible foothold. The instant he became solid, he would step straight into the fire.
"You think a fire like this can trap me?" Obito said coldly. Before he had even finished speaking, however, he realized something—he had already remained intangible for a long time.
Standing outside the sea of fire, Sasuke watched him quietly, his crimson Sharingan as composed as a hunter studying his prey. "Each time you turn intangible, you can maintain it for roughly five minutes. That's the limit of your Sharingan's Kamui ability. The Fourth Hokage recorded that information after fighting you all those years ago. I suppose you never knew."