In your opinion, did the Emperor take into consideration the possibility of Luke and Vader teaming up mid-duel against him? (Just like in Mara Jade's visions or in the LEGO games). Was he ready for a fight?
I'm not talking about contingency plans like resurrection after death, possessing Luke's body and stuff. And don't tell me "Luke and Vader did beat Palpatine together lol" cause that happened after the duel. I mean mid-fight, father and son turn together against the Emperor. Was he ready for an actual fight in your opinion? Did he bring any lightsaber? Or his own self-assurance had grown so much that the possibility of Vader betraying him to usurp his throne alongside his son would've been a total surprise?