Some thinks are not meant to be mentally "mindfucking". This is one of those things heres the dialog:
<P>Shirley: blah blah i want to bring lelouchs sister back
*Geass activates and Shirley is the one with a gun in her hand he obviously took it and shot her in the heart while his geass was activated and the only one with a known anti-geass was in convo. if im absolutely wrong w/e but i think its pretty clear and rolo is pissed and might kill/or attempt Nunally.