Nope, because the particular Genjutsu you used does not actually block out sound, and that is one way for opponents to be notified of your upcoming jutsus. And that Genjutsu submission is kind of OP...O_O'
Well, by forcing people to counter it with a fire/wind move, you basically have them take up a spot in their jutsu slot. It's actually predictable, known as the
cause and effect. For example, you used a Wind Jutsu to blow away the explosive tag, thus, I can follow up with a prepared fire move to disregard your Wind Jutsu, so that it overcomes it and is sent back at you two times stronger.
By taking the upper hand, you can juggle your opponent around and have them react the way you want to, as we are all forced to make moves and survive in a battle. This is most often used in chess, where it is necessary to be able to predict several moves ahead of the opponent.
It's actually important to know this in Genjutsu because, as I said it earlier, a lot of this is psychological warfare.
Now, since we're done discussing the Kunai, let's move on to the Shurikens.
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How might they work and how would you use them in battle?