containtment, yes sensei! *grabs yet another balloon, and focuses his chakra, the begins to make the air content of the ballon stirs rapdily, while keeping in mind the containment his sensei mentioned. Keeping his chakra strong, rotating, balanced and contained, the rasengan begins to form inside the balloon. The rubber ball, isn't sitrring now, but now works like a membrane around the rasengan*
Now sensei?