I think Tanaka killed Agni under orders of real Ciel. There were 2 people attacking them after all. I still can't get over it ╥﹏╥
But WHY? The only thing I can think of is so spare Ciel would be isolated but was killing Agni/trying to kill Soma really necessary.
Yeah, I hope they explain why Ciel's twin was after Soma and killed Agni because it doesn't make any sense because they done nothing wrong but be nice to Ciel.
I think that's the point.
The only thing I could think of is that real Ciel knows who are close to our Ciel. And will use them to get him a message? That's usually the case in other stories. You know: "I'll kill everyone close to you 1 by 1 if you don't give what I want" or "Get rid of everyone close to you just for revenge" something like that. And Sohma and Agni just happen to be there.
Hope they give us more info in next chapters, indeed #－.－)
Personally I think the real ciel is trying to isolate are ciel by killing everyone that it's close to him to make sure he has no one he knows in the world so he can be alone and that the real Ciel can take over
Okay, so that's how there are two of them, whatever. Now get to explaining why the real Ciel killed Agni and tried to kill Soma.