[But she knows now. She knows that he's not only used Geass on Euphie, but he's poisoned Guilford with it too.]
This is... before that time for you. You haven't been affected by his power yet, so... I was only trying to protect you, Euphie. [It goes without saying that Lelouch is dangerous. Even if it was not his intention to use it on her, he shot her so easily when he could have tried to save her.]