I hope this wasn't already posted if it was, im really sorry.
I was reading through older chapters and I realize something was not right.
When fighting deidara, Sasuke was able to see where the bombs were (underground) and even Deidara's C4 Garuda.
Then he fought Itachi, Itachi died, Sasuke was told the "truth" (which I believe it is), and he activated MS.
Ok now, this is what I dont understand.
Why is he shocked? He has his sharingan activated. Wouldn't he be able to "see" a color in Killer Bee's blade? can't he not see color in chakra anymore?