A few more ideas for the splash.
1. Shows off his ability to create shards of ice from water.
2. Preparing ability to before an attack.
3. Rushing in for a kill.
4. Another ability of his is to enchant his sword with water to create a longer and sharper water blade.
I'm gravitating towards the 4th one. The idea of infusing weapons with magical powers seems really cool. What do you think?