[Katara shrugs a little and stops holding onto the ice. The heat from her body will melt it soon enough and she drops her hand down. She can tell that Nami didn't exactly have the reaction she was hoping for and kind of regrets bringing it up -- but drawing water from a place where there was 'none' in a time of need... that part of Hama's lesson was nothing to be ashamed of and she straightens her shoulders.]

I've made fog as cover before, but I've never really worked with it any other way. But it's water. I don't know why it would be any different.