He knew something as basic as that wouldn't be enough to take down Uchiha. With his Byakugan, he can spot the incoming kunai without bothering to look straight at them; as they approach, again, he spins into the Kaiten, letting them deflect as he charges forward again, snatching his kunai and adding his own from his holster, crossing both arms and hurling them forward again.

"I thought you didn't have to run, Uchiha." It's a taunt, lips curved into a wide smirk. If he thought a few kunai were enough to get through his defense, he'd be sorely mistaken.