Board Thread:Versus Debates/@comment-27233105-20160130092635/@comment-5936871-20160214030400

Orochimaru is a fast character, but he is not nearly as fast as Minato is, and Orochimaru was in a severely weakened state at that time, he was being cocky, not paying attention, and thought that he had Itachi where he wanted him, and Itachi being able to seal a stationary target at such close range doesn't help the blade's speed either.