He had no grudge against Obito, and Obito had clearly come for this box.
Mui had no intention of staying behind to guard it.
To him, this thing was a ticking time bomb. Keeping it nearby had only been a last resort. If Obito wanted it, he could take it.
Obito sneered and swiftly dashed toward Mui.
A great mass of flames rose from Mui's body, gathering into two flaming swords in his hands.
But in Obito's intangible state, the two flaming swords slashed straight through his body.
Obito passed through Mui and pursued Muku.
He could not let Muku escape.
Muku had not gotten far when he heard his father Mui shout from behind him, "Muku, get down!"
Without a second thought, Muku threw himself forward.
An enormous Shuriken flew over his head.
It shot straight into the doorway ahead.
Boom!!
A dull impact rang out as the giant Shuriken embedded itself completely in the doorframe.
It blocked off the passage entirely.
Muku rapidly formed Hand Seals. "Fire Style: Hōzuki Lantern!"
His body abruptly transformed into a massive blaze, flying toward the exit.
Behind Obito, Mui raised his two flaming swords and slashed at him again.
Obito could no longer reach Muku with his hand.
If he used Kamui, Mui behind him would have time to attack.
So—
Obito's two Kamui eyes began spinning rapidly.
A blue Susanoo instantly shielded Obito, then threw a punch at Mui.
Mui's flaming swords were destroyed in an instant.
The punch struck Mui in the side. He spat out a mouthful of blood and was sent flying.
At the same time, Obito activated Kamui. A tremendous suction force came from his eyes.
A vortex wind dragged Muku's flaming form toward his eye.
The flames were about to be pulled into the Kamui Dimension.