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Right now Airspout can go on every surface even water so what if when its on water it displace some of it also waterbenders should be able to attack with the water spiraling the spout
I don't think airspout is meant to be thought of in a whirlwindy way where it would pick up water.. If an airbender is above water, a waterbender can very easily source the water below them and break the spout.