I recently got an order of plants in from a supplier and two of 6 plants had the growth points snapped off... One is N. rafflesiana (a beautiful reddish / purple form) and a node started growing almost immediately... the other was N. gracilis and the main stem looked very similar to your plant (broken tip, several dead leaves, the other leaves were spotted) and the entire vine died, but a basal shoot has started growing...
I had two other Neps that ended up with damaged growth tips (N. ventricosa and N. 'Judith Finn') and the next node sprouted and started growing... heavens above, 'Judith Finn' is a SLOOOOOOOOOW grower in my conditions... I've never grown N. northiana, so obviously I've never tried to strike cuttings from this species. Maybe someone else can speak to how easy the plants are to grow from cuttings?
It seems that I've seen lots of posts from people receiving Neps with broken growth points... I'm wondering if they're all from the same supplier? (I know we can't name other suppliers here...) If the plants are from the same source, maybe they need to take a look at their packaging methods?
Anyway, best of luck! All is not lost...