[he could remain silent, and let Hiro try and explain it; Hiro doesn't know what's going on, at least not fully. and rather than have him share incorrect information and have to be corrected- the microbots still for a moment, locking themselves in place, and then 'relax'.

which really just means that it's a somewhat looser structure upon him, but still as though he's wearing a suit of mail.

but where to begin, without giving more information than need be...?]

It started a few days ago. I woke up, and they were covering me like a blanket- they moved back as soon as I realized it, but the fact remains that they're responding without the neurotransmitter, and to...noncommands.

[his voice remains steady, but as before, the microbots 'speak' for him- tiny agitated ripples that are only so much in his control.]