As soon as he's got a barrier between himself and the man (who seems familiar? But he'll investigate that in a moment), Vash starts looking around for anything to use as a weapon. What can he throw? Can he push this big shelf over? Are there any other people in the building that he'll need to run away from too? Why won't his feathers go down!?

But then, finally, the man speaks, and Vash realizes that he knows that voice. Or rather, he knows that person, just in different forms.

Cautiously, he pokes his head out of his hiding hole, still ready to run should it prove a trap. "Big brother?" No names, never names where humans could hear, he learned that lesson the first day he was allowed to use the radio. Is it really Nai, all grown up?