Lelouch takes advantage of the ceremony’s tragedy to finally declare the independence of Japan. With the change to his Geass, he’ll have to make more sacrifices or else it could lead to more misfortune. For the revenge he seeks, it may be what he needs.
For Euphy's sake. Besides,
I made up my mind a long time ago.
Es ist wegen Euphi, nicht wahr?
Tu fais ça pour Euphie, non ?
Moi, ma décision est prise.