I saw this question about Nautilus's ultimate, and the answer shows that it can be beat by Master Yi (in the example).
I was wondering as Nocturne, it's worth spend my ultimate to run from Nautilus Ult? or it's not worth (the distance still got me)?
In this video:
it shows that you can use flash to interrupt the ultimate in the middle air. So I could jump near to an enemy and flash to avoid contact with him, so I could scape from Nautilus ultimate and don't need to engage in another fight.