Board Thread:Versus Debates/@comment-34938099-20180728104553/@comment-26107879-20180730003015

@Brain

The difference between Sasuke and Itachi's speed isn't a large margin. So it doesn't matter how fast he is. Obito still saw him, reacted to him, and phased the specific part of his body to dodge the attack while he was in Shunshin. Which means, shunshin speeds are within his visual prowess.