... I don't rememder this. O_o
In fact, the few times I got in trouble on the ASMB didn't involve the balloon thing at all. I never even received a warning over the balloon thing (Or if I had, they forgot to tell me).
I know you weren't talking about air.
I just also know that the implied non air substance can't be expelled with enough force or volume to actually blow up a balloon. It can only fill it. That was the source of the confusion.
I'm kinda worried about Dynasty Warriors 9. It's supposed to be open world, and I've yet to find an open world game I've actually liked except for Far Cry 3 Blood Dragon (Though I only really liked that due to the ridiculous 80's ptesentation. I didn't like the gameplay much at all).
They had to be using a fake dong with a pump, a well hidden hose attached to a pump, or one of the "self inflating" balloon tricks to create the illusion of that happening.
That is not possible by normal means.