In order for Norma to complete the rites to authorise going to war, Oroveso demands to know who will be the sacrificial victim. At that moment, Clotilde rushes in to announce that a Roman has desecrated the temple, but that he has been apprehended. It is Pollione who is led in, and Norma is urged to take the sacrificial knife to stab him but, approaching him, she is unable to perform the deed. The assembled crowd demands to know why, but she dismisses them, stating that she needs to question her victim.