Its as you say, and probably best used in a RP manner. Though against an opponent with no sensory, it would be pretty useful, but with all the meta gaming going on these days, its risky as hell. And I like the tactic you just gave, and I think someone has done that before in a test, where he hid a clone inside it, lightened the Toad with that Earth technique and literally threw it towards the proctor. Though there are some other uses I could think up, one should think ahead before using this technique. Overall, its a fast technique, and could be used quite nicely in the Ninja World and sometimes in battle.