AWaterfaller might be like me, looking for a way out—in which case there is always the possibility that my universe might be their way out, that they propose to do much the same as I would, in the same circumstances, stepping forward through a gateway they have made and preparing to unpick the threads of everything and re-establish their own place. In the best or worst case, our causality is already circular and it would actually be me, entering the nascent universe to reconfigure it in my own favour.