[She's silent, for a moment, to let him speak. She doesn't bother to ask what 'reprogramming' means -- Rei has an inkling as to what it entails, given the angels' strict adherence to policy and Castiel's venomous hatred of the system in general.

Reprogramming? Probably torture. Or, given their power, perhaps an entire memory wipe. Though Castiel rebelled shortly afterwards -- so Rei realizes, with a twist in her stomach, that it was probably just torture.

Disgusting.]

Another great thing about memories is that they've already happened.

[She forces a smile.]

You only have to deal with the aftershock, not the rest -- not ever again.