Kane heard the sound of a few Zoras gossiping (word always travels fast throughout the Zora's Domain). "King Ralis went over towards Snowpeak," one of them says. "It seemed urgent."
Hearing them talk about one of the mountains Kane had familiarized himself with piqued his interest. If the king had been specifically needed there, it was something special. Intrigued, Kane pushed himself up and went to investigate.