Paradise lost had an abrupt ending and left me wondering more about Satan I was surprised it didn’t continue a story on him it instead continued to finish up with Adam and Eve in Eden. Then the idea that their children shall have revenge on Satan reassures them. Which is a promise made by heaven that seems to shift total blame onto Satan.
“ late Promise made them, that her Seed should be reveng’d on the Serpent“Paradise Lost,Milton,https://milton.host.dartmouth.edu/reading_room/pl/book_10/text.shtml
I think it only expands on the feeling of subjugation that is delivered by the text. On top of having the entire blame shifted onto Satan they are also turned into serpents.