Trauma and fear.

Lelouch vi Britannia

Shirley? Is that really you?

Lelouch vi Britannia

I saw you die... I watched you slip away...

Shirley Fenette

Lulu, I've been waiting for you.

Shirley Fenette

Why didn't you save me from Deathstroke?

Lelouch vi Britannia

That maniac shot you... and the Joker just laughed!

Lelouch vi Britannia

(That's why I killed him. That's why I killed them all. My Geass... my curse...)

Shirley Fenette

But Lulu, I never met those people. How could I have been killed by someone I never met?

Batman

She's not real, Lelouch. This is Scarecrow's fear toxin.

Batman

You're experiencing hallucinations of your worst fears.

Lelouch vi Britannia

No! She's here! Shirley is here!

Lelouch vi Britannia

I can't lose her again...

Batman

Your mind is mixing memories with fiction. Scarecrow targets what haunts us most.

Batman

Trust me, I know what it's like to see ghosts.

Lelouch vi Britannia

Does the pain ever stop?

Lelouch vi Britannia

(Even with my power to command anyone... I couldn't save the one person who truly loved me.)