What does haimon mean when he says then she must die but her death will cause another?

When Haemon says, "then she must die but her death will cause another," he implies that the death of Antigone will not be without consequences. He suggests that her demise will lead to further suffering and potentially another death, possibly his own or that of someone else who deeply cares for her. This reflects the themes of fate and the interconnectedness of actions in the play, emphasizing the tragic repercussions of rigid adherence to law and authority. Haemon's statement underscores the idea that the cycle of tragedy will continue, highlighting the futility of such a sacrifice.