... Oh. Yeah. He'd forgotten about the-- what was, exactly? Had they ever really pinpointed that? No, they hadn't. Erk. Glancing (not so) discreetly off the side - it looked even stranger in person, but that wasn't exactly the nicest thing to point out - only to look back a second later. It was strange, talking about practicing without a gun in his hands, but he'd left that piece of weaponry at the door... Didn't mean he'd take off his coat, but still.
"Aaah..." Even if it was the second time, Vash did still get rather jumpy when it was mentioned. "... Sure~" To anyone else, he'd look like an inexperienced fighter trying his hand on a level way over his head; and his 'style' was just like that. Klutzy in a planned fashion, never the one to move first.
Dodge reflex, some would call it. Aka, sparring was less like what he figured it was supposed to be and more like pseudo-falling or just plan Don't-let-Allen-get-a-hit-in.