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I'm starting to think very few people have actually watched the series. Nobody. chibends. Bending is already using chi, but chi isn't used up ever. If you run out of chi, you die. Hence why having your chi blocked leads to other physical issues such as paralysis, and occasional fainting. Also, BENDING IS NOT MAGIC, This is literally one of the first lines ever uttered in series. Benders aren't wizards and Benders aren't Pokémon. You can't go suggesting things like they can only bend so much, or waterbenders are super effective on firebenders. Not how it works. The skill and ability of a bender is all dependent upon their physical and spiritual skill.