Why didn't the Geass work on Kallen the second time?


Why didn't the geass work on Kallen the second time Lelouch used it?

<https://www.youtube.com/watch?v=Bfgyr91rr9Y>




Because Lelouch's Geass can only be used on a given person once, ever. This is
one of the fundamental limitations of his Geass. Indeed, it is when his second
Geass on Kallen fails that Lelouch realizes that this limitation exists.

