Throws a large amount of Void fireballs.

Waaaai! Fire…mugyuu?
Naruto was of similar thoughts.
"Black…fire?"
Certainly, like unholy will-o-wisps, four flickering flames of color of midnight floated on the tips of Setsuna's tails.
"This," Setsuna stated. "is the fire that consumes all. The fire that needs no fuel, as it is driven by a sentience beyond our limited, mortal comprehension. The fire that forever hungers, and solely exists to reduce the world to nothingness. The fire that will burn for seven days and seven nights."
"This is Void Fire, boya. A blessing, and a curse, all Void Kitsune are born with. The Uchiha call it Amaterasu. It's a stupid name: there's nothing remotely divine about it."
"Now, my student, you shall learn to fear this flame. Now, dodge! If you know what's good for you!"
And Naruto ran for his life, for he was assaulted by an endless barrage of black flame bullets. Setsuna shot her tiny fireballs like a machine gun, chasing Naruto throughout the labyrinthine paths between the endless pillars. Naruto did notice that the flames did not dissipate after impact. They remained wherever they struck, lingering and relentlessly burning the ground itself.