@ DDBen: Okay I guess I misunderstood. Oh and to be able to turn someone else's genjutsu against them I would expect that there has to be a huge disparity between the level of the two users like with Itachi and Kurenai. I doubt that could happen with Sasuke and Itachi.

Since you mentioned the curse seal when I was reading this chapter one thing was bothering me. To break out of the technique Sasuke went CS2 within the genjutsu much like when Naruto tried to break out of Itachi's genjutsu before by using some of the Kyuubi's chakra. So does what the victim of the jutsu do within the jutsu really matter because I would expect that Sasuke himself would have transformed at that point but it doesn't appear that he did.