Imagine two children huddled up behind some rocks and bushes at the edge of a camp in which several perhaps-not-exactly-humans are wandering around. Heavily armed as well. The children? Not so much. The red-headed girl with the tail has a simple staff, though both ends are weighted down with bands of iron and capped at each end with a solid metal clump as well.

"Okay." It's surprisingly quiet, for a whisper coming from a child trying to be sneaky. " We need to get him and then he can help you get back to Nanashi, which's the important thing, and then Xuanzang can have his horse back." Huashi huffs slightly, shaking strands of red hair out of her eyes to peer at the camp and the regal, white stallion tied in the center of it.

They'd been told to stay put along with the monk, of course. But then the demons hit and they had to scatter and when daddy and the other two came back without Xuanzang's horse, the kids were present but not the monk. So they'd been told to stay put, again, as the three left to save Xuanzang.

Again.

But Kotarou needed to get home, and the Goddess of Mercy had said only the Prince could take him home... and Huashi knew that meant Xuanzang's horse. Therefore, they needed to save him.