[Tadashi shifts closer to Hiro as Callaghan talks, wanting himself between his brother and whatever danger the other man might or might not present to him.]

Without the transmitter... Are they responding to your emotions?

[Because that would explain a lot of their strange behavior, the ripples and spikes and all that. It's also the worst sort of thing that could occur to a tool like the microbots. They're small, but so powerful in large numbers, already so dangerous in the wrong hands. To have them responding to emotions or subconscious thoughts...]

Did something happen to the neurotransmitter while you were wearing it? A short or any other kind of damage?