Lelouch's example becomes an order, and Euphemia opens fire into the crowd, then order her soldiers to as well.
The opening of the Special Administrative Zone becomes a lie and a massacre.
Zero orders the Black Knights to fight. Only he and C.C. know that this was a mistake.
Zero shoots Euphemia himself.
Suzaku pulls her out of battle in hope of saving her, but she only gets a short amount of time.
Just enough to make it clear that she doesn't remember what happened and would never have endorsed it.