@aystarr: Localized freezing for this fight does not really matter, especially not enough to give Tonraq an edge. Katara has also bent steam, perfume, clouds and water that she couldn't see. I don't think that matters either, but if your looking for more of a variety of skill, Katara's got it. Some other feats I remember was Katara, along with Aang, stopped a large ship from going down a rapid waterfall (until another ship crashed into them). Her impressive ice breath; stopping a Fire Nation tank, and also lifting and encasing another tank in ice. And then her ice breath against Jet.
This was all before her final training with Pakku.