It would appear that the avatar was far more aware of his possible inability to swim than Katsuro was. That or he fell into the water and didn't come back up and now people were panicking. Katsuro thought about his actions leading to the death of another, especially a fellow countryman and someone who too his knowledge did not deserve it. For a second he contemplated turning around and jumping into the water to the save the boy. Instead however halfway through his motion he noticed the ruckus further up into the stands. Security was running over there and there seemed to be a large crowd. "So that's where he landed huh?.. Katsuro smiled out of satisfaction and relief. Satisfaction that it seemed that the kid must have been quite hurt for all the ruckus, and Relief knowing that he would more than likely be safe for now. With that he began walking into the tunnel, there was no reason to head back up into the stadium right now.