Board Thread:Naruto Discussions/@comment-1872728-20160329033053/@comment-2005101-20160331041945

He's talking about the time Madara commended how well Sasuke was moving while attacking him, attributing it to this "Choku Tomoe" they share. Madara was just saying that Sasuke was doing an exceptional job of reading, and reacting to his own movements. It's not all that different from the manner in which Sasuke's movements were becoming more sharp and efficient after his Sharingan matured, and allowed him to better perceive Naruto's high speed attacks during their first fight at the Valley of the End. Not sure why some of the articles here don't just say that instead of perpetuating this "fluidity of movement" stuff. It's not like their eyes are blessing each step they take with more grace and finesse or somethin'.

The "Straight Tomoe" does not refer to the literal shape of the Mangekyō Sharingan's pattern, but some unspecified aspect of the dōjutsu itself. Kishimoto didn't exactly elaborate, but Madara was likely talking about their Eternal Mangekyō Sharingan; he was the only Uchiha known to successfully create one before Sasuke did. Coincidentally, they both happen to be incarnations of Indra's chakra.