If we couldn't be born on the same day, then we shall choose to die together, a saying which was often used by couples who were deeply in love with each other. Somehow it could also be used to describe two enemies in extreme rivalry, with a little twist, that is to fight till the bitter end. In fact, when the enemies have reached the stage of only one of them could live, they would usually die together in the end.
Ning Que decided not to bother about the black peach blossom which was launching toward him but instead swung his cutlass toward Long Qing. He was inviting Long Qing to die together, though he himself did not have the intention to die. Ning Que believed Long Qing would not compromise himself just like that, therefore he would retreat and Ning Que would have gained an advantage.