Good thing he can absorb it through Preta Path.Catching Nagato off guard and using amaterasu will end it.
1. Amaterasu is too fast for him to dodge. So he have to
Use ningendo or shinra tensei.
2. Sasukes case is different he csn coat himself in amaterasu
Use it as a sword.. Once touched its over.
And if you think that I'm implying Nagato > Sasuke then you're mistaken. I really don't care which is stronger.
This is about as much as I expect from you.We already seen Amaterasu take care of Nagato, doesn't matter if people disagree cause the manga doesn't