Board Thread:Theories and Speculation/@comment-31338621-20200901181802/@comment-31338621-20200903205338

@Ninja Of War: Tsukuyomi in the scenario in the opening would make it so Obito experience of the world would seem sped up extremely in the point of view of Obito or whoever Itachi's fighting, to the point he only has a short amount of time (a microsecond in Tsukuyomi time) to react or break Tsukuyomi. However, Itachi would have more than enough time in real-time (5 seconds) to decapitate his opponent. So basically Itachi manipulates the opponents sense of time to the point where:

1 microsecond Tsukuyomi time = 5 second real time.

Why do you think Tsukuyomi can't be used simultaneously with combat?