As Tobi and his doppelgangers dash off, they were startled by raging and vile beast made of bones that suddenly emerge in their path. They figured it was an attempt to block their movements, so they press forward.
Both doppelgangers would maneuver side-by-side each other, drawing the attention of the beast, while simultaneously amassing an enormous amount of chakra in their right hand, which would be used to drive a Big Ball Spiral Sphere into the skeleton beast's body, smashing them to pieces.
Following short behind the doppelgangers, Tobi had seen Rand's approaching, ready to engage.
Stopping Rand's advances, Tobi parried Rand's blade with his blade. And begin a barrage of horizontal slashes, which was used to push him back. In between those slashes, Tobi had managed to fire needles from his mouth, spitting them at Rand's chest, aiming for vital spots.
While Tobi and Rand were battling, Tobi's doppelgangers were searching for an opening. They eventually found one, grabbing ahold of Rand and holding him down so that Tobi can get a clean cut with his sword, piercing his stomach.