My guess is they use a different, more authorative, unquestionable sounding voice, followed by changing the whole room's coloring some way (Similar to Death Note's "visual effects" or something).
I can't decide whether the red text will be said by her own voice actress or a different one, but it's not that important for me.
Using "text bubble"-s sounds a bit lame IMO (though it might be possible to do it appropriately enough).
|