He's about to confirm that, yes, there will always be a possibility of something going wrong, but then she's asking him to put it down, drawing a perplexed tilt of the head from the white-haired man. And so he does put it down--into the palm of his hand. Hey, it's not floating any more, that's what she'd meant, right?

"Trust?" The word is spoken as if foreign, its definition unknown. "Trust is a vague concept. In this instance, you are concerned that I will bring you harm intentionally. This is not the case." His other arm--similarly floating--hovers over the ball of contained gas and taps it, sending ripples across the surface of the bubble, but it remains intact. "This residual material is inert--that is, in coming into contact with living specimens, no effect has been observed. It cannot transfer the disease designated VIOLET2710."