"He would if I told him to." Out of fear, perhaps! Or out of some desire to know what Vash is capable of himself; the only hope humanity had needed to be able to effectively fight back against a far stronger opponent, after all.

There's a sidelong glance back at Vash, and what sounds awfully like a put upon sigh. "When I use this area as an example it's not a demand you start right now, little brother. This sort of emptiness is where you should practice, not necessarily this very moment; there's nothing here to harm." And inevitably there would be another tragic spiral of angst and misery should Vash accidentally kill one of his precious humans while attempting to learn his very nature. "...But very small. Very.. One could squash the entirety of this planet down and only get a hole maybe two centimeters across."

A speck. Less than a speck. Those tiny less than a specks had been enough to disrupt everything Knives had been doing. "Or bigger ones, and use them to ... I don't know, carve your name into the desert floor. Add another eye and a smile to the fifth moon."

Probably not good ideas.