i watched this scene last night on blu-ray. the thought occured to me, did Vader block Luke's strike to save the emperor's life? Or did he do it to save Luke from the dark side?
the line before is palpatine telling Luke to "take your Jedi weapon. strike me down with your hatred and your journey towards the dark side will be complete." so in a sense by blocking Luke's strike Vader prevents Luke from turning to the dark side.
Also, suppose Luke had killed the emperor, then by the rule of 2 who is the new master? Since according to the rule of 2 the only way to become the new Sith Master is for the apprentice to kill the master. So wouldn't killing the emperor have made Luke the new master and Vader his apprentice?
the line before is palpatine telling Luke to "take your Jedi weapon. strike me down with your hatred and your journey towards the dark side will be complete." so in a sense by blocking Luke's strike Vader prevents Luke from turning to the dark side.
Also, suppose Luke had killed the emperor, then by the rule of 2 who is the new master? Since according to the rule of 2 the only way to become the new Sith Master is for the apprentice to kill the master. So wouldn't killing the emperor have made Luke the new master and Vader his apprentice?