I think they decided to end it there with Euphemia on her deathbed. It would be overdoing it if she still tried to kill Suzaku and his Geass was activated.
And, if Suzaku did kill Euphie, even by accident, he would go insane. He wouldn't be sane enough for another season.
(no subject)
And, if Suzaku did kill Euphie, even by accident, he would go insane. He wouldn't be sane enough for another season.