Kouyou has to put conscious effort into affecting more than the air actually passing through her throat, so no, no accidental levitations or broken glass. She uses the levitation trick as a training excercise, though, and can in fact stage a bitchin' puppet ballet or fight scene, though the more items involved the less control over each one. Animating a puppet with mobile arms and legs takes ten... call them impulses, I guess, one push and one pull each for the body and each limb to control thier position.
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows
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"Anko, what you do in your free time is your own choice. Use it wisely. And if you do not use it wisely, make sure you thoroughly enjoy whatever unwise thing you are doing." - HymnOfRagnorok as Orochimaru at SpaceBattles
woot Med. Eng., verb, 1st & 3rd pers. prsnt. sg. know, knows