Board Thread:Naruto Discussions/@comment-25442883-20160112162355/@comment-25093611-20160112200312

it can be either, sasuke activated tomoe-rinnegan alongside EMS, this can mean that he needs EMS for space-time or he simply wanted to activate in ordeer to fight with full-power towards his enemy,

plus, i actually think rinnegan is less taxing than EMS, afterall EMS needs active control and activation, while rinnegan can be activated and used without any extra-effort (fro nagato), it is powerful this was why obito didnt take the second rinnegan (plus i dont think he wanted to lose his kamui) but it doesnt seem to take a lot of chakra if it is only activated ^_^