The water's surface never returned to its calm state.
Windward Formation's attacks didn't stop once, chasing Leopold into the water. The water would have some effect on both characters and skills, and the water battle training for pro-plays was to help familiarize them with these effects.
Team Everlasting's Warlock was hoping that he might get an opportunity to turn the tides upon falling into the water. He could use the experience he had with water battles to escape from the opponent's attacks, but he soon realized that his opponent's grasp of this was no worse than his own, no… it should be that it was even better.
So falling into the water turned out to be a misfortune for Team Everlasting. With the movement speed he had currently, he didn't know if he would be able to escape from Windward Formation's attack range.