Logically, the dagger should have fallen somewhere in front of him since he had been attacked from behind with the throwing dagger.
Zavier heard a familiar whistling sound and turned around just in time to see that dagger heading towards him once again. Just as he dodged the incoming dagger, something even more shocking happened. The dagger also turned towards him mid air and whistled towards him again.
Zavier had finally found a troublesome enemy who was capable of threatening him. The force behind the dagger was enough to pierce his blood mist. He had to prepare a strong defense like he was currently using. But the price for that was the loss of offensive capability. Otherwise there would have been too many holes in his defense that the hidden enemy could take advantage of.