Kitten is volunteering Yuuki for any canceling we might need to do on it. I wasn't sure how long you wanted her rampage to last! Lelouch's first impulse will be (paralyzed horror) (but after that!) getting the necklace back onto her, but he doesn't need to be immediately successful. She's certainly capable of outrunning him.
But I figured even if we got the necklace back on, Lelouch would still want to seek Yuuki out so as to fix this "for real", you know? So that could still happen regardless... :|a