Kain was nearby Kami, he didn't want to disturb her but it seems she had very acute senses. Something he was thankful for. But, he just walked by and let her enjoy herself in the water. He was looking for Zetzu since the link they had was closed. Which made him think that something was wrong.
I kept walking and ignored everything to feel the light breeze in the night. I closed my eyes and heard a haunting and mesmerizing tune in the wind. I opened my eyes and looked up to see a girl sitting on the edge of a cliff with her eyes standing out in the night. "Who are you?" I asked and brought my blade out to point at her. She reminded me of someone, but I couldn't tell who.